Archiv der Kategorie: Middle Nile

How magnetizable are you? – Magnetization in archaeological prospection

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In my latest blog post, I discussed how to read magnetograms and what we have to keep in mind regarding the Earth’s Magnetic Field and the location of the concerning site. Another important factor to approach the comprehensive interpretation of our data is the environment, esp. the geology, geomorphology and formation processes of the region. For magnetometry, it is especially the knowledge about magnetic properties (ferromagnetism) of rocks, minerals and soils.

The magnetogram shows the total magnetization, which is composed by the induced and the remanent magnetization (Fig. 1). The relation of induced and remanent magnetization is described by the Koenigsberger ratio (Q-ratio). It informs us not only about the quality of the rock sample for paleomagnetism, but also if we are dealing with archaeological objects.

Figure 1: Magnetization for rocks with induced and remanent amounts (Lowrie 2007, 321 fig. 5.40 a).

The induced magnetization exists with an applied external field only, e.g. the Earth’s Magnetic Field, and mostly goes along with the direction of the Earth’s Magnetic Field. For interpreting our magnetograms, it is helpful to conduct additional magnetic susceptibility measurements in the field, which tells us more about the induced magnetization. The magnetic susceptibility describes how magnetizable a sample/material is in an applied field. It is affected by the type of contained minerals as well as their grain size. The resulting values are unit less and can be negative (diamagnetic) or positive (ferromagnetic, ferrimagnetic, paramagnetic). Susceptibility can be measured in the field as well as in the laboratory, where more precise measurements are possible and additional parameter can be investigated.

The remanent magnetization is a permanent magnetization, independent of an external field, and important in paleomagnetism and archaeomagnetism. The natural remanent magnetization is the sum of the remanent magnetization and can be composed by several elements. For archaeological prospection, one of the most important remanent magnetizations is the thermoremanent magnetization (TRM). It is formed through heating of material over Curie temperature and cooling in an applied magnetic field, whose direction (Declination) is saved. Kilns, ovens and burnt objects like pottery or bricks etc. are the best examples for TRM. Chemical remanent magnetization (CRM) can be found in sedimentary or metamorphic rocks, whereas detrital remanent magnetization (DRM) develops during sedimentation of small magnetic particles in smooth water. Isothermal remanence (IRM) is the reason why we can detect also lightning strikes (LIRM) in our magnetograms. Although remanent magnetization is usually permanent, several factors could alter it, such as weathering.

But why are some materials/rocks more magnetic or magnetizable than others? It depends on iron oxides. Iron oxides are not only responsible for magnetization but also playing a role which colour a material has. The most important iron oxides regarding archaeological purposes are magnetite, maghemite, greigite, hematite, goethite as well as titanomagnetites, occurring in soils. While magnetite and maghemite are showing up to 1000 times higher susceptibilities than hematite, the latter is responsible for the typical red colour. Pedogenic, anthropogenic, lithogenic, and bacterial processes are responsible for the enhancement of soils, esp. top soils. Additionally, originally nonmagnetic materials can show enhanced magnetization: magnetotactic bacteria in organic materials are generating magnetite so that already gone posts, palisades etc. can be detected by magnetometry.

Magnetic susceptibility measurements in the field can be carried out selective e.g. for scattered objects and rocks on the surface or areal (separate geophysical prospection method). They can be used to define the extension of archaeological sites, activity zones or features in human made environments. Furthermore, they help understanding the morphology, formation processes, erosion and sedimentation as well as stratigraphic sequences for climate research and soil formation processes. Usually, top soils as well as archaeological soils are showing higher magnetic susceptibility values caused by enhancement of magnetic minerals due to the use of fire and fermentation. That is the reason why we can detect areas of human activity, e.g. settlements, and determine their extension.

How can we transfer this knowledge to the MUAFS concession area? The geological map of the Nile valley shows mostly sandstones, siltstones and mudstones accompanied by metavolcanic rocks as well as colluvium, sand sheets and dunes. For the volcanic rocks, we can assume high magnetic susceptibilities, whereas for the sandstones, siltstones and mudstones weak magnetic susceptibility is rather likely, depending on the contained minerals.

During the first geophysical campaign, we conducted spotty magnetic susceptibility measurements on our sites as well as the environment. Therefore, we used the handheld Kappameter SM-30 (Zh-instruments, Fig. 2). While magnetometry is a passive method, magnetic susceptibility meter are active instruments with a small coil included. Sampling the scattered rocks and archaeological objects like mudbricks gives an idea what we can expect in the magnetogram. Furthermore, the method can be applied in excavation trenches e.g. to distinguish stratigraphic layers or walls/floors and susceptibility maps can be produced. Due to magnetic susceptibility it is feasible to differentiate sources of raw material e.g. for mudbricks.

Figure 2: Measuring the magnetic volume susceptibility of a mudbrick laid out in the sun for drying with the Kappameter SM-30, showing a value of 2.22 [10-3 SI] (M. Scheiblecker).

For the settlement site GiE 001 at Ginis East, the scattered rock material shows mostly susceptibility values in a range of 0,302 to 0,826 [10-3 SI], esp. quartz, schist, and sedimentary rocks, while rocks of volcanic origin result in values around 7,5 [10-3 SI]. The surface values are ranging between 4,35 to 5,6 [10-3 SI] and mudbrick from a partly upright standing hut shows values of around 4 [10-3 SI]. For this site, we could expect therefore the following: walls made of sedimentary rocks would cause negative anomalies in the magnetogram, while the use of volcanic rock would result in positive anomalies. Mudbrick or galus walls (of stamped mud) are more difficult to predict; depending on their mineral composition, they are revealing positive or negative anomalies. Fire installations or the use of fired bricks would be easily recognizable because of their high values.

A profile along a street close to the Nile River shows the different sedimentation layers very nicely: different colours as well as susceptibility values can be seen in Figure 3.

Figure 3: Magnetic susceptibility values (in 10-3 SI) of a profile next to the Nile (M. Scheiblecker).

This example shows the complexity of magnetic susceptibility in combination with colours; darker and brighter layers show similar values, whereas the surface reaches the highest value. The layer with pebbles reveals the lowest value due to the included pebbles of probably sedimentary origin. For understanding the environment of archaeological sites and their formation processes, it is important to consider not only the survey, excavation and magnetometry results itself. Furthermore, knowledge in geology, geomorphology as well as the investigation of their parameters add details for a comprehensive picture of an archaeological landscape.

At the end, if you are asking yourself how magnetizable you are: without any ferromagnetic items from your clothes or e.g. glasses, the magnetic susceptibility would be almost zero or even negative, as the human body consists mostly of water.

References

Aspinall, A.; Gaffney, C.F.; Schmidt, A. (2008): Magnetometry for Archaeologists. Geophysical methods for archaeology 2. Lanham: AltaMira Press.

Butler, R.F. (1998): Paleomagnetism: Magnetic Domains to Geologic Terranes: Electronic Edition. Boston: Blackwell.

Dalan, R. (2017): Susceptiblity. In: Allan S. Gilbert, Paul Goldberg, Vance T. Holliday, Rolfe D. Mandel and Robert Siegmund Sternberg (eds.): Encyclopedia of Geoarchaeology. Dordrecht: Springer Reference (Encyclopedia of Earth Sciences Series), 939–944.

Fassbinder, J.W.E.; Stanjek, H.; Vali, H. (1990): Occurrence of Magnetic Bacteria in Soil. Nature 343 (6254), 161–163.

Fassbinder, Jörg W. E. (2017): Magnetometry for Archaeology. In: Allan S. Gilbert, Paul Goldberg, Vance T. Holliday, Rolfe D. Mandel and Robert Siegmund Sternberg (eds.): Encyclopedia of Geoarchaeology. Dordrecht: Springer Reference (Encyclopedia of Earth Sciences Series), 499–514.

Lowrie, W. (2007): Fundamentals of Geophysics, Cambridge: Cambridge University Press.

More than greyscale: How to read magnetograms in the MUAFS concession area

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The magnetic data collected at our first campaign in the Attab to Ferka region in 2018/2019 was first processed and interpreted directly after the field season. After the first excavation campaign in 2020, focusing on two of the four geophysically investigated sites, a reconsideration of the data took place. It is based on the excavation results, the photogrammetric data and new kite images.

But before looking at the data, you have to know where exactly on earth the data was generated! The Earth’s magnetic field is a complex system, which is protecting us against ultraviolet radiation, as it is deflecting most of the solar wind, which is stripping away the ozone layer. The earth’s magnetic field can be visualized as a three-dimensional vector: Declination (angle in ° to geographic north, X), Inclination (horizontal angle in ° or magnetic dip, Y) and Intensity (measured in T “Tesla” resp. nT “Nanotesla”, Z). In archaeomagnetism, all components are measured to be compared to the single curves of the region. For magnetometry and interpreting these data, the Inclination is the most important value besides the Declination, which helps for example to detect in situ burnt features. The Inclination describes the angle in which the Earth’s Magnetic Field meets the surface of the Earth itself. Therefore, the angle is changing depending on your position e. g. if you are closer to the magnetic poles or to the magnetic equator.

The geomagnetic field changes all the time, every second, every day, and every year! For Munich resp. Fürstenfeldbruck you can follow the alterations simultaneously here. The geomagnetic observatory there is part of the Ludwig-Maximilians-Universität and the Department of Earth and Environmental Studies. As you may know, the magnetic poles are wandering as well. The magnetic north pole did it that fast in the last years that the navigation map had to be changed before the standard interval of five years in 2019. This world magnetic model (WMM) is available online.

But why do we have to know especially the Inclination of the area we are working in and doing magnetometry? The shape and intensity of every single anomaly is depending especially on the Inclination! The shallower the Inclination the wider the anomaly is visible in the magnetogram. Additionally, the dipole (positive/black – negative/white) components are changing. The closer we are measuring to the geomagnetic equator (not the geographic equator), the larger gets the negative part of the anomaly and the lower are the amplitudes of the magnetic signal. Figure 1 illustrates the differences in Inclination for a single anomaly.

Figure 1: Anomaly strength of the total field intensity as north-south traverse through the anomaly’s centre for different Inclinations (Ostner et al. 2019, 181 Fig. 2).

While the Inclination in Munich is around 64°, the Inclination in the MUAFS concession area is 27-28° and shallower. The components of the Earth’s Magnetic Field at the MUAFS concession area are illustrated in Figure 2, showing a Declination of almost 4° and a total field intensity of around 39.000 nT (Munich: 48.585 nT). The measured archaeological and geological features, visible in the magnetogram, are showing contrasts of sometimes less than 1 nT. Due to different Inclinations, the same archaeological feature would result in a different anomaly in Sudan compared to Munich. While the anomaly in Sudan would be wider (see the red curve, Fig. 1) than in Munich (ca. the blue curve, Fig. 1), it would cause lower intensities as well as showing more negative parts than the Munich one. This means while in Bavaria the negative part of an anomaly is regarded more as a small “white shadow”, in Sudan it would be almost equal to the positive part of the anomaly. Furthermore, depending on the depth of the buried feature, the shift in locating the feature could be larger with shallower inclination.

Figure 2: The Earth’s Magnetic Field in Sudan after World Magnetic Model (WMM) 2019, with the MUAFS concession area in red (M. Scheiblecker).

Regarding the used magnetometer – a gradiometer, the intensities are additionally lower than for example with a total field magnetometer, which makes it more difficult to interpret the data and why sometimes low value-features like pisé walls are not detectable with gradiometers. Furthermore, with wider anomalies closer to the geomagnetic equator like in Sudan, it is more possible that anomalies are overlapping so that it is not easy to distinguish features lying next to each other or from different periods.

Usually, magnetograms are shown in greyscale to avoid confusion and “pseudo-limitations” of different values and colors. For interpreting the data, one can play around with the minimum and maximum values as well as inverting of the greyscale version. On magnetograms of measurements with the total field magnetometer usually a high-pass filter is applied, which can be overlayed with the total field data as well.

In rare cases it is helpful to use color scales for the magnetograms additionally to show special features better or to highlight some very high or low values. If the magnetogram is disturbed by high magnetic anomalies like metal fences, iron rubbish on the site etc., color scales are not useful anymore, because they are showing especially the disturbances due to their high amplitudes and less of the archaeological features itself. Nevertheless, it is possible to adjust the color scale as needed for every site separately.

Illustrating the mentioned methods, I would like to show the magnetogram of GiE 002, where a cemetery is located.

Figure 3: Magnetogram of GiE 002 in greyscale (M. Scheiblecker).

The usual greyscale (Fig. 3) shows clearly the traces of the recent and former wadi/khor, tumuli-like features in the very south as well as lots of features of different shape in the northern part of the magnetogram, interpreted as graves. They are resulting in positive anomalies, accompanied by negative anomalies of different amplitudes.

Figure 4: Magnetogram of GiE 002 in blue to red color scale (M. Scheiblecker).

To understand more of the single burials it is helpful to change to a blue-red color scale (Fig. 4). In this way, it is easier to differentiate the single anomalies consisting of the positive (red) and negative (blue) part.

Figure 5: Magnetogram of GiE 002 in highlighted grey scale, showing maximum values in red as well as minimum values in yellow (M. Scheiblecker).

Highlighting the minimum and maximum values – in yellow resp. red – helps e. g. focusing on the probably best-preserved archaeological features located in the center of the measured area, visible in Figure 5.

The magnetograms of GiE 002 show clearly that it is worth playing around with different color scales and that there is more than one magnetogram important for interpreting the data for archaeological and geological purposes.

References

Fassbinder, J. W. E. (2017): Magnetometry for Archaeology. In: Allan S. Gilbert, Paul Goldberg, Vance T. Holliday, Rolfe D. Mandel and Robert Siegmund Sternberg (eds.): Encyclopedia of Geoarchaeology. Dordrecht: Springer Reference (Encyclopedia of Earth Sciences Series), 499-514.

Livermore, P.W.; Finlay, C.C.; Bayliff, M. (2020): Recent north magnetic pole acceleration towards Siberia caused by flux lobe elongation. Nature Geoscience 13, 387–391.

Ostner, S.; Fassbinder, J. W. E.; Parsi, M.; Gerlach, I.; Japp, S. (2019): Magnetic prospection close to the magnetic equator: Case studies in the Tigray plateau of Aksum and Yeha, Ethiopia. In: James Bonsall (ed.): New Global Perspectives on Archaeological Prospection. 13th International Conference on Archaeological Prospection. 28 August – 1 September 2019. Sligo – Ireland. Oxford: Archaeopress, 180-183.

In focus: Site H25 in the Northern Dongola Reach

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In the framework of the DiverseNile project, I have introduced the application of ‘contact space biographies’ as a new concept in the study of intercultural encounters in the Middle Nile. We will specify the question of cultural encounters through the distribution of the sites and their duration, settlement infrastructures, building techniques, production activities and technologies, trade, diet, material culture, burial customs, religious practices and social structures. The importance of peripheral areas, like the Attab to Ferka region, for our understanding of cultural formations will be stressed. In line with this, the DiverseNile Seminar Series 2021 focuses on cultural diversity in Northeast Africa, giving several case studies from various perspectives.

Our next presentation, to be held tomorrow by Loretta Kilroe, will introduce an exciting example of so-called ‘provincial’ Kerma remains in the Northern Dongola Reach.

Site H25 was partly excavated in the last years and yielded settlement remains and evidence from the Kerma, New Kingdom and Napatan eras (Ross 2014; Porter 2019; Kilroe 2019). The site is, among others, shedding new light onto trade networks in New Kingdom Nubia. Because Loretta is an expert on ancient Egyptian and Sudanese pottery, she will focus tomorrow on ceramics and what they can tell us about frontier economics.

I am personally very much looking forward to this exciting presentation about an as yet little known but very important site! As usual, last minute registrations are still possible and highly welcome!

References

Kilroe, L., 2019. ‘H25 2019 – the ceramics,’ Sudan & Nubia 23: 81‒84.

Porter, S., 2019. ‘Excavations at H25 in the Northern Dongola Reach,’ Sudan & Nubia 23: 77‒80.

Ross, T.I., 2014. ‘El-Eided Mohamadein (H25): A Kerma, New Kingdom and Napatan settlement on the Alfreda Nile,’ Sudan & Nubia 18: 58‒68.

Facing colonisation together? The collective use of tombs in New Kingdom colonial Nubia

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I studied various cemeteries throughout Nubia for my PhD on the role of foreign objects in local contexts in New Kingdom colonial Nubia. The most important of these cemeteries are Aniba, Sai and Soleb. Other important cemeteries are either gradually coming to light (e.g., Amara West) or remain totally unpublished (e.g., Sesebi). I was interested mostly in variation across sites, which I explored through an analysis of distributions of types of objects at each of them. However, the sites that I just mentioned also have a lot in common.

One of the aspects that instantly caught my attention was the collective use of tombs, both synchronically and diachronically. It is interesting how Egyptologists usually interpret New Kingdom Nubia through the lens of Egyptianisation, but at the same fail to recognise one structural difference between the organisation of elite cemeteries in Egypt and Nubia in the New Kingdom. While elite tombs in Egypt, in places such as Thebes, bear an essential connection with one’s individuality, tombs at elite cemeteries in Nubia are essentially collective. One well-documented example is tomb 26 on Sai island, which will be published very soon (Budka 2021).

These tombs are usually interpreted as family tombs, which remains a plausible hypothesis. Elite tombs in New Kingdom Nubia usually consist of a vertical shaft leading to a main chamber connected with various smaller burial chambers. Inside these smaller chambers, there are the burials of more or less contemporary individuals. Individual chambers are usually occupied by “couples”; e.g. Khnummose and his alleged wife at Sai tomb 26 (figure 1) and Wsir and Taneferet at Aniba tomb S91. Later burials are usually placed in the larger main chamber, where archaeologists usually find scattered bones, and disarticulated skeletons alongside New Kingdom Egyptian-style objects and later pottery styles in upper layers. In extreme cases of tomb reuse, vertical shafts could be completely filled with burials, one on top of the other, as evidence from Soleb demonstrates.

Figure 1: burial chamber of Master of Goldsmiths Khnummose and his “wife”. Courtesy of the AcrossBorders project.

If we move to non-elite contexts we’ll find a different situation. In a context of overall material limitations, cemeteries are characterised by a vast majority of single burials possessing no burial goods or a few pots. The best example of non-elite cemetery in New Kingdom Nubia is Fadrus, which bears similarities with various non-elite cemeteries in New Kingdom Egypt in terms of scarcity. However, at Fadrus, a few larger tombs contained a considerably higher quantity of burial goods. These tombs are characterised by their collective use, both contemporaneously and by later generations.

I have suggested in a paper that will be published in the next Sudan & Nubia that the larger, collective tombs of Fadrus should not be interpreted as evidence for inter-site hierarchies, as has been done in the past. Instead, in my forthcoming paper, I suggested that these tombs should be interpreted through the lens of collective engagement theory (DeMarrais and Earle 2017; Lemos forthcoming). In a context of scarcity within a colonised Nubia, people seem to have gathered together to achieve more, namely access to Egyptian-style objects, including more restricted items within the New Kingdom Nubian mortuary landscape. On the contrary, those who remained by themselves ended up buried with no accompanying goods. It is possible that a similar collective logic was behind the organisation of cemeteries associated with Egyptian temple-towns such as Aniba, Sai and Soleb. However, it remains a difficult task to distinguish phases and individual burials sharing restricted Egyptian-style objects due to the high degree of plundering and the quality of most of the published evidence (see Näser 2017).

With DiverseNile, my focus turns to a different social space: geographical peripheries of temple-towns. Elite cemeteries associated with colonial centres seem to have been organized by extended families buried in collective tombs which were later reused. Non-elite cemeteries consisted of mostly poor individual graves with a few larger collective tombs housing the bodies of individuals potentially sharing objects that remained out of the reach of most their peers. In a different way, the burial evidence from the peripheries usually consist of graves scattered through the landscape with and a few ‘formal’ cemeteries. Scarcity also seems to be the rule here. However, there are also collective exceptions.

Chamber tomb 5-T-32 was among the sites excavated by the West Bank Survey from Faras to Gemai in Lower Nubia (figure 2). It consisted of a shallow mudbrick tomb divided into an entrance area leading via an unblocked arched doorway to an outer chamber or chapel, and a sealed arched doorway leading to the burial chamber. The tomb was located in the periphery of Mirgissa, one of the earlier fortresses reoccupied in the New Kingdom, and was plundered in ancient times. The excavators dated the tomb to the mid-18th Dynasty. The fact that no burials were placed in the outer chamber distinguishes tomb 5-T-32 from tombs at elite cemeteries associated with centres of colonial administration, such as nearby Aniba. The remains of 38 individuals were recovered from the burial chamber, eleven of which in situ. The bodies were deposited in an extended position, and remains of wood and rope suggest the existence of simpler mat coffins tied with ropes, which also appear in non-elite contexts in Egypt. Finds include steatite scarabs with parallels found at various Nubian cemeteries, New Kingdom pottery including a pilgrim flask, and a bronze finger ring and wooden headrest, which were more restricted objects in the Nubian mortuary objectscape of the New Kingdom.

Figure 2: tomb 5-T-32 in Abu Sir, periphery of Mirgissa (Nordström 2014: 135–137; plates 32–33).

In a previous post, I discussed tomb 3-P-50 at Ginis West containing some nice restricted Egyptian-style objects, despite its tumulus superstructure. Although the tomb was plundered, with only scattered bones being recovered, it was most likely used collectively. After looking at the evidence from tombs such as 5-T-32 and 3-P-50, located in the periphery of Mirgissa and Amara West, respectively, I started feeling like there’s something happening here. At this stage, I’m still scratching the surface, but I think it’s probably a good idea to keep pursuing the communal engagement path to see what we can potentially learn from the peripheries of colonised Nubia. Therefore, I was especially happy to hear Andrea Manzo talk about heterarchy and communal engagement in Eastern Sudan in our last DiverseNile seminar (see also Manzo 2017). Degrees of variations can be detected amid elite sites, while evidence from non-elite sites provides us grounds from which to discuss alternative social realities taking place in colonised Nubia. I don’t really know what to expect from the colonial peripheries, but I’m optimistic evidence from these areas will allows to expand the discussion on alternative social realities, especially in the light of fresh excavations planned for the near future.

Further reading

Budka, J. 2021. Tomb 26 on Sai island: A New Kingdom elite tomb and its relevance for Sai and beyond (with contributions by J. Auenmüller, C. Geiger, R. Lemos, A. Stadlmayr and M. Wohlschlager). Leiden: Sidestone Press [in press].

DeMarrais, E. and T. Earle. 2017. Collective Action Theory and the Dynamics of Complex Societies. Annual Review of Anthropology 46: 183–201.

Lemos, R. 2020. Material Culture and Colonization in Ancient Nubia: Evidence from the New Kingdom Cemeteries. Encyclopedia of Global Archaeology, ed. C. Smith. https://doi.org/10.1007/978-3-319-51726-1.

Lemos, R. forthcoming. Heart Scarabs and Other Heart-Related Objects in New Kingdom Nubia. Sudan & Nubia 25.

Manzo, A. 2017. Architecture, Power, and Communication: Case Studies from Ancient Nubia. African Archaeological Review 34: 121–143. https://doi.org/10.1007/s10437-016-9239-6.

Näser, C. 2017. Structures and Realities of the Egyptian Presence in Lower Nubia from the Middle Kingdom to the New Kingdom. In Nubia in the New Kingdom: Lived Experience, Pharaonic Control and Indigenous Traditions, ed. N. Spencer, A. Stevens and M. Binder, 557– 574. Leuven: Peeters.

Nördström, H.-Å. 2014. The West Bank Survey from Faras to Gemai. Oxford: Archaeopress.

Anything than marginal: A View from Eastern Sudan and Mersa/Wadi Gawasis by Andrea Manzo

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Our DiverseNile Online Seminar Series under the general topic of “Cultural Diversity in Northeast Africa” has a wide chronological and regional scope. Tomorrow, we will expand this scope and include Eastern Sudan and the Red Sea. We will continue with an exciting presentation by Andrea Manzo (Università degli Studi di Napoli “L’Orientale”) who will speak about “Complexity and Connectivity Between the Nile Valley and the Red Sea in the 3rd and 2nd Mill. BC. A View from Eastern Sudan and Mersa/Wadi Gawasis”.

Our speaker is Professor of the Archaeology of the Nile Valley and Ethiopian Archaeology at the University of Naples „L’Orientale“ and has a rich record in fieldwork in Sudan and Ethiopia. He is one of the key figures who started to explore Eastern Sudan with state-of-the-art methods and theories in the last decades. Previously considered as “margial” area, simply reflecting our previous focus on the Nile Valley rather than desert areas, we now have a basic understanding of the complex history of this region over the millennia. His excellent book on Easter Sudan is available in Open Access and highly recommended (Manzo 2017; see also Manzo 2019). Most importantly, Andrea Manzo and his team were able to illustrate the high level of connectivity of Eastern Sudan with the Nile Valley and also the Red Sea, in particular Mersa/Wadi Gawasis. His work allows to contextualise several findings which go far beyond the reconstruction of trade but show the importance of areas outside the Nile Valley.

In Eastern Sudan, there are in particular the so-called Gash Group and the Jebel Mokram Group which are highly relevant to our understanding of cultural diversity in Bronze Age Sudan. Especially the Gash group is intriguing, with several sites where locally made and also imported ceramics were found, including „exotic ceramics showing similarities with Kerma, C-Group, Pan-Grave“ (Manzo 2017, 33).

Thanks to Andrea Manzo, we now understand Eastern Sudan as a crossroad between the Nile basin, the Eastern Desert, the Ethio-Eritrean highlands and the Red Sea. I’m really looking forward to tomorrow’s presentation within the DiverseNile Seminar Series on previously neglected regions far away from the Nile Valley!

Participation is free and registration via email is still possible. See you all tomorrow!

References:

Manzo, Andrea 2017. Eastern Sudan in its setting: the archaeology of a region far from the Nile Valley. Access Archaeology; Cambridge Monographs in African Archaeology 94. Oxford: Archaeopress.

Manzo, Andrea 2019. Eastern Sudan in the 3rd and 2nd millennia BC. In Raue, Dietrich (ed.), Handbook of ancient Nubia 1, 335-365. Berlin; Boston: De Gruyter.

New research goals at the time of Covid-19. Testing Raman Spectroscopy on Nubian and Egyptian-style pots

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If there is something that the Covid-19 pandemic has taught us is resilience, work flexibility and mostly the capacity to design alternative solutions to meet the various physical restrictions and newly shaped work conditions and needs. Further, we learned the importance of networks and acquiring skills even in remote formats, and that online (and/or hybrid) classes and conferences can give virtuous outputs as those in presence.  Within the framework of our project, a successful  example of this is certainly represented by our online Diverse Nile Seminar Series 2021 Cultural Diversity in Northeast Africa.

For me operating within the Work package 3 of the project and principally dealing with laboratory analysis on the material data – ceramic samples – collected in the field, the pandemic has inevitably meant that I had to shift my main focus from the study of fresh excavation data to the study of reference collections. Hence, in the last months my work schedule has been mainly centred on documentation, database archive, and comparison among the various ceramic datasets. Also, the obligatory permanence in Germany (missing the field and the warmness of the Sudanese sun) together with the need to work often via remote or, whenever possible from the lab, pushed me to convey my working goals to search for new theoretical approaches and interpretative inputs, eventually enlarging the spectrum of the analytical competencies and methodologies devoted to the study of the ceramic samples.

In these circumstances the idea was born together with our PI and other colleagues from the Department of Earth and Environmental Sciences of the LMU to cooperate and expand the networking between our departments hence to test together a new analytical methodology for archaeological ceramic material, namely Raman Spectroscopy.

This technique, which took its unusual name after the Indian physicist C. V. Raman who was the first to observe Raman scattering in 1928 and won a Nobel Prize in Physics in 1930 for this discovery, is a molecular spectroscopy procedure which provides information about vibration and rotational states of molecules. It works using the interaction of a source of monochromatic light, normally an intensive monochromatic laser radiation, and the matter of the sample. The largest part (99.99%) of the laser light radiates through the sample, a very small proportion is scattered in all spatial directions (so-called Rayleigh scattering), finally an even smaller part is scattered inelastically (so-called Raman scattering). This latter contains information about the sample, its molecular structure (no the single chemical elements) and specific characteristics of the material (see among others, Spieß et al. 1999; also What is Raman Spectroscopy? | Raman Spectroscopy Principle (edinst.com); Raman spectroscopy – Wikipedia).

For the study of archaeological samples like ceramics, Raman spectroscopy has the advantage of being a non-destructive (only a minimum portion of the sample as the same slide of the thin section is needed), rapid and relatively low-priced technique. However, the high potential of this methodology may collide with the natural heterogeneity of most of the ancient, especially hand-made, ceramic manufactures (Medeghini et al. 2014; Vandenabeele & Van Pevenage 2017; see also Legodi & de Waal 2007). This is why, at the moment, our goal consists primarily to observe the methodological potentials of Raman and discern its use for our specific research questions.

For our trial study, we selected ten samples (of which six are ceramics from Sai Island and four from the Dukki Gel’s reference collection). All of them are either locally produced cooking pots or other local ware manufactured both according to the so-called Nubian and Egyptian style (Figure 1). In testing this new analytical technique, our main aims are the following: to search for differences in producing technique and firing temperatures/regimes 1) between the Nubian and Egyptian-style samples; 2) between the Nubian samples from Sai Island and those from Dukki Gel; 3) between the Egyptian-style samples from Sai Island and those from Dukki Gel; 4) among the different Nubian types (cooking pots with basketry impressions, incisions, and others). In addition, we also want to look at the behaviour of the organics and their carbonization and check for a possibility of a better characterisation of some opaque mineral phases.

Figure 1 – Examples of Nubian cooking pots with basketry impressions from Sai Island (left) and Dukki Gel; Kerma (right).

In the last days, together with the colleague Fabian Dellefant, geoscientist and doctoral student at the Department of Earth and Environmental Sciences of the LMU, we have realized high resolution scans of the selected ceramic thin sections and photographed them at the petrographic microscope under different light conditions (both transmitted cross polarized and plane polarized light, and also reflected light) in order to describe and document the areas which we are ultimately going to analyse by Raman.

Stay tuned to know more about our ongoing work and first results!

Selected references and links

Legodi, M. A. &, de Waal, D. 2007. Raman spectroscopic study of ancient South African domestic clay pottery, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 66, Issue 1, 135-142.

Medeghini et al. 2014. Micro-Raman spectroscopy and ancient ceramics: applications and problems. Journal of Raman Spectroscopy, 45, Issue 11-12, Special Issue: Raman in Art and Archaeology 2013, 1244-1250.

Spieß, G. et al. 1999. Eine einfache Einführung in die Raman-Spektroskopie. LMU. Die quantitative Analyse (uni-muenchen.de).

Vandenabeele, P. & Van Pevenage J. 2017. Raman Spectroscopy and the Study of Ceramic Manufacture: Possibilities, Results, and Challenges. In Hunt, Al (Ed.) The Oxford Handbook of Archaeological Ceramic Analysis.

What is Raman Spectroscopy? | Raman Spectroscopy Principle (edinst.com)

Where’s the population of New Kingdom colonial Nubia?

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David Edwards‘ recent publication of ‚Pharaonic‘ remains in the Batn el-Hajar provides an important comparison point for us to understand the evidence from DiverseNile’s concession area from Attab to Ferka. From a mortuary landscape perspective, Edwards criticises archaeology’s traditional focus on elite tombs in the Middle Nile saying that we „should not narrow our perspectives, to the exclusion from our narratives of the vast majority of the population who were buried otherwise“ in areas other than the centres of foreign colonial power in Nubia (Edwards 2020: 396).

Until recently, a similar picture could be drawn for Egypt. Despite large non-elite cemeteries being known since the early 20th century (e.g., Matmar or Gurob), a monumental/elite bias characterised historical narratives about New Kingdom Egypt (see Richards 2005). Only recently, with the identification and excavation of large non-elite cemeteries at Amarna (Kemp et al. 2013), more scholars are paying attention to other social realities beyond the imposition of elite social spaces.

The long history of archaeology in the Middle Nile has been strongly marked by colonisation, ancient and modern. Nubia’s history, especially in the New Kingdom, has remained, for a long time, in the shadow of Egypt’s history. This manifested as the discipline’s Egyptocentric focus on sites of colonial administration, its textual sources and elite cemeteries, which yielded Egyptian-style objects interpreted as essentially ‚Egyptian’—a manifestation of the alleged acculturation of passive local communities placed in lower ranks of ‚civilisation‘. Traditional, Egyptocentric research agendas contributed further to silencing past colonised groups, which only appear in Egyptian textual sources in inferior positions.

As a result, we still know barely anything about the majority of the population of New Kingdom Nubia, which inhabited areas other than the major colonial centres of power, e.g., Aniba, Sai, Soleb. The cemeteries at these sites house a small number of monumental tombs that, although used collectively, still represent a tiny fraction of society across the history of ancient colonial Nubia.

Who were the majority of the population of New Kingdom Nubia? Where did those people live and where were they buried? Where did they come from? Under what conditions did they live (and die)? Although research is moving forward to address new topics (see Spencer et al. 2017), these are questions that haven’t been explored for Nubia yet, mostly due to archaeology’s focus on acculturation/Egyptianisation in the New Kingdom.

Areas such as the Batn el-Hajar and the region south of Dal cataract, including DiverseNile’s concession from Attab to Ferka, are unlikely to yield monumental elite tombs. However, peripheral, today inhospitable desert areas along the Middle Nile hold an enormous potential to impact our narratives about ancient Nubia’s colonial past, shedding light on alternative histories, experiences and forms of being-in-the-world beyond Egyptological/Egyptocentric research interests grounded on sites of Egyptian colonial administration in the New Kingdom. So, where did the majority of the population live and die in New Kingdom Nubia? Likely in the geographical and social gaps along the Nile still to be fully explored.

Even at colonial administrative centres, such as Aniba, Sai and Soleb, social relations were more complex than simply being ‚Egyptian‘. Recent work confirmed, through isotopic analysis, that local individuals lived at those sites and worked in colonial administration; e.g., the master of goldsmiths Khnumose and other individuals close to him (Budka 2021). My previous work on the distribution and use of Egyptian-style objects in local contexts in colonial Nubia, which included subversive transformations of stylistic and use patterns, also show that things weren’t homogenous in colonial Nubia (Lemos 2020).

Currently, we know very few non-elite cemeteries in New Kingdom colonial Nubia. If social relations were far from being uniform at colonial centres of power, at non-elite cemeteries there was even more room for negotiations, which resulted in the shaping of alternative material realities and experiences of colonisation. Examples from non-elite cemetery of Fadrus in Lower Nubia allow us to understand better such negotiations, which could result in alternative social relations other than imposed colonial hierarchies (e.g., collective engagement and collaboration), as I have argued in a forthcoming paper (Lemos forthcoming).

Fadrus alone doesn’t fill the gap in our knowledge about the vast majority of the population of New Kingdom colonial Nubia, neither does the collective use of elite tombs at the centres of colonial administration. In both elite, administrative sites and non-elite sites, Egyptian-style material culture opens windows to complexity and diversity beyond previous homogenising interpretations of New Kingdom colonial Nubia that reflect disciplinary colonial traditions and interests. Therefore, turning our attention to ‚peripheral‘ regions previously neglected holds an immense potential for us not only to detect this vast mass of population left out of historical narratives, but also to uncover alternatives to colonial homogenisation (ancient and modern) through people’s diverse experiences of landscape, society and culture.

Fig. 1: non-elite graves at Ginis East (Villa 1977: 39).

Vila’s survey identified several burial sites, which are comparable to non-elite cemeteries, although most of the Vila sites don’t seem to be large „formal“ cemeteries like Fadrus (figure 1). DiverseNile’s focus on the regions where the majority of the population of the New Kingdom colonial Nubia lived and died is an important step towards understanding diversity and complexity in heterogeneous New Kingdom Nubia. Exploring such sites in comparison with other sites in Nubia holds a huge potential for us to rewrite Nubia’s diverse history in the New Kingdom, which was characterised by various, sometimes competing material experiences of colonisation, especially considering the creative potential of people living and dying at the fringes of society.

References

Budka, J. forthcoming 2021. Tomb 26 on Sai island: A New Kingdom elite tomb and its relevance for Sai and beyond. Leiden: Sidestone Press.

Edwards, D. 2020. The Archaeological Survey of Sudanese Nubia, 1963-69. Oxford: Archaeopress.

Kemp, B. J. et al. 2013. Life, Death and Beyond in Akhenaten’s Egypt: Excavating the South Tombs Cemetery at Amarna. Antiquity 87: 64–78.

Lemos, R. 2020. Material culture and colonization in ancient Nubia: Evidence from the New Kingdom cemeteries. Encyclopedia of Global Archaeology, ed. C. Smith. https://doi.org/10.1007/978-3-319-51726-1.

Lemos, R. forthcoming 2022. Heart Scarabs and other heart-related objects in New Kingdom Nubia. Sudan & Nubia 25.

Richards, R. 2005. Society and death in ancient Egypt. Cambridge: CUP.

Spencer, N. et al. 2017. Introduction: History and historiography of a colonial entanglement, and the shaping of new archaeologies for Nubia in the New Kingdom. In Nubia in the New Kingdom: Lived experience, pharaonic control and indigenous traditions, ed. N. Spencer, A. Stevens and M. Binder, 1–61. Leuven: Peeters.

Vila, A. 1977. La prospection archeologique de la valee du Nil au sud de la cataracte de Dal 5. Paris: CNRS.

A View from Sai Island

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Tomorrow, the second lecture of our DiverseNile Seminar will take place. This time, it will be me presenting and I will talk about “Cultural Diversity in Urban ‚Contact Spaces‘ in New Kingdom Nubia: A View from Sai Island”.

Sai Island is one of the prime case studies to investigate settlement patterns in New Kingdom Nubia. In tomorrow’s presentation, I will focus on state-built foundations like Sai as colonial urban sites and their hinterland. I will explain why I introduced the concept of ‘contact space biography’ for the DiverseNile project and outline this approach.

A view from Sai Island: here towards Gebel Abri.

The starting point for my new research in the Attab to Ferka region were several open questions deriving from my work on Sai between 2011-2018 – tomorrow, I will address some of them, stressing why a view from a colonial temple town is crucial to understand cultural dynamics in rural and peripheral regions of the Middle Nile.

The location of Sai Island in the Middle Nile.

Since time is limited, I will select some examples to address cultural diversity in New Kingdom Nubia: the use of the so-called fire dogs and the question of cooking pots as well as foodways in general. For the latter, I would like to introduce the ‘food system’ concept as presented by Kelly Reed in a brand-new article which provides much food for thought. Reed argues that with such an approach, archaeologists are required to consider „all the processes and infrastructure involved in feeding a population“ (Reed 2021, 57). This does seem particularly fitting for the DiverseNile project and our aims.  I also very much like her attempt to apply system theory and social-network analyses to highlight the multiple links between society, environment and food. Within our contact space of the Attab to Ferka region, we also want to identify the specific stakeholders (actors such as families, individuals and official institutions as well as the ‚goverment‘, thus the Egyptian state) of this ancient Bronze Age ‘food system’ and thus presumably showing complex connections between the urban sites of Sai and Amara West and their hinterland with rural sites like villages at Ginis and Kosha. New information on food supply and distribution systems will be highly relevant to reconstruct contact space biographies in our project. Last, but definitly not least, the peripheral settlements in our research concession were always an integral part of the ‘food system’ of Sai and contributed to the dynamics we can trace in this state-built foundation (cf. Sulas and Pikirayi 2020, 80).

For more, please zoom in tomorrow at 1pm, late registrations are of course  still welcome!

References:

Reed, K. 2021. Food systems in archaeology. Examining production and consumption in the past. Archaeological Dialogues, 28(1), 51-75. doi:10.1017/S1380203821000088

Sulas, Federica and Pikirayi, Innocent 2020. From Centre-Periphery Models to Textured Urban Landscapes: Comparative Perspectives from Sub-Saharan Africa, Journal of Urban Archaeology 1, 67–83 https://www.brepolsonline.net/doi/epdf/10.1484/J.JUA.5.120910

Discussing theory and methodology

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I’ve been really busy with several commitments besides my research project, but I’d like to give you a quick update about what I’ve been up to lately. As you know, my WP2 research focuses specifically on the data collected by Vila within the region from Attab to Ferka. However, in order to have a more comprehensive idea of the significance of this data, comparison with other regions is a key aspect of my methodology. If sites such as tomb 3-P-50 at Ginis West allow us to start challenging ingrained conceptions about society and culture in New Kingdom Nubia, e.g., colonial ‘centres’ and ‘peripheries’, putting sites like this into a broader context is a really important step.

In previous posts, I stressed the importance of data sets like those produced by the ASSN or the Finish Expedition in the Batn el-Hajar area, as well as sites in the 4th cataract. But comparative research shouldn’t be limited to feeding information from different sites into a database, although it remains an important aspect of my research. A descriptive approach to data would allow us to identify previously ignored data, especially for regions that are not usually part of major narratives about Nubia, e.g., the Attab-Ferka area. However, a clear theoretical approach allows us to abstract descriptions into understandings of broader social phenomena.

I’ve recently been invited to speak in the New Perspectives on Ancient Nubia seminar series, co-hosted by the Bade Museum and University of California Berkeley. In my talk, I discussed the role and potential of postcolonial and decolonial theory for New Kingdom Nubia. A broader theoretical approach allows us to bring together evidence from different contexts into a general narrative about social logics that both produce and are produced by the material culture we investigate and describe in our databases.

Postcolonial theory has had a huge impact in archaeology, although its role in the Nile valley has not always been that explicit. Postcolonial theory provides us with a framework from which we’re able to criticise colonial narratives and practices, but also to unveil hidden, silenced logics that have remained outside mainstream historical narratives. This is highly important for the DiverseNile theoretical and methodological framework.

Egyptian-style material culture has been understood, as whole, through a generalising lens that emphasised the Egyptian presence and transposition of knowledges and practices to an acculturated Nubia. My research in the last few years allowed to unveil, from a postcolonial perspective, alternative realities created by transformed foreign objects in local contexts in New Kingdom Nubia (I explore this further in a forthcoming paper on heart scarabs, which will be published in the next issue of Sudan & Nubia). So, developing and applying a postcolonial approach to our data from the region from Attab to Ferka, combined with information from the very centres of colonial power in New Kingdom Nubia, will certainly shed more light on the substance of diversity, allowing us to include regions traditionally excluded from historical narratives into histories of alternative experiences created and sustained by alternatives roles performed by spreading material culture. That’s a bit of what I’ve been reading, thinking and writing lately. I’d be happy to think about these issues together with anyone interested!

First preliminary remarks on the petrography of the Dukki Gel ceramic samples

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In the last few weeks I haven’t been very present in our blog since I spent much time sitting at the microscope of the Department of Earth and Environmental Sciences of the LMU, just nearby to our office, examining and documenting the first batch of ceramic samples from the site of Dukki Gel. These samples have been included as a reference collection within our DiverseNile project thanks to the kind agreement of the excavator, Charles Bonnet, and the responsible ceramicist Philippe Ruffieux. Philippe has already studied all of these samples within their context and we can now address fresh questions within the DiverseNile work packages and with scientific analysis.

In times of the Covid pandemic, the procedure to access the laboratories is rightly strict: registration is mandatory before working in the microscopy room, only a maximum of three people are allowed to work simultaneously in the lab and of course we are required to wear medical masks and disinfect all devices and workspace at the end. All this will seem obvious, but what I personally find curious is the contrast between the meticulousness of the analytical procedure, further complicated by the current Covid rules, and the simple and tangible nature of the ancient ceramics, whose immense  anthropological and material complexity, and huge archaeological interpretative potential is all enclosed in a thin section of just 30 microns thick.

In my last blog post – I introduced the method I use for the classification of the ceramic samples and the layout within the Filemaker database which I specifically designed for the purpose of the petrographic study.

So far a total of twenty-one ceramic samples from Dukki Gel has been analysed by optical microscopy (OM), while forty-three samples are currently located at the Atominstitute in Vienna where they are being analysed for instrumental Neutron Activation Analysis (iNAA) by our colleague and external expert in the project Johannes Sterba.

Most of the samples for OM (18 out of 21) are Nubian vessels among which are cooking pots (both basketry impressed and incised ware), jars, globular vessels and also fine black topped Kerma ware. Further, three Egyptian-type vessels (two red slipped bowls and one fragment of a bread mould) were analysed under the microscope.

Petrographically, the Nubian samples from Dukki Gel appear quite homogeneous in term of their composition, displaying mineralogical and textural features which also resemble very much the petrography of the Nubian samples analysed from the New Kingdom town of Sai Island (see D’Ercole and Sterba 2018; D’Ercole in prep.). Differences in the textural features, in the proportion of some specific mineral phases, and in the amount and type of the organic tempers contained in the paste allowed distinguishing four principal petrographic groups or micro fabrics. The first group is characterized by a very sandy framework with a dominant grain size in the class of silt to very fine-grained sand, a good sorting of the non-plastics and very few organics mainly small and tubular in shape. The second group also displays a sandy framework, sorting is moderate with some medium sized rounded quartz and feldspar possibly added as temper, and common tubular organics partially carbonized and moderately aligned. Group 3, to which belongs the majority of the analysed samples, is sandy, moderately sorted, with common to abundant organics, either partially or completely carbonized, heterogeneous in shape and size,  and possibly referring to various parts of plant remains (including stem, glume, palea, and lemma?) (Fig. 1) and also herbivore dung. Finally, the fourth group of Dukki Gel Nubian samples contains abundant heterogeneous organics similar to group 3 but also large carbonate inclusions of microcrystalline calcite most likely intentionally added as tempering material. To this last group, which does not show a real comparison with the material from Sai, where the presence of calcite was ubiquitous and seemed a natural component in the clay source/ soil rather than a tempering agent, refers exclusively cooking pots with basketry impressions and a single jar.

Figure 1 – Detail of organic inclusion with visible plant cell structure from Sample DG-17. PPL micropho by G. D’Ercole.

All in all, similarly to what was observed for Sai Island, the petrofacies of the Nubian ceramics is very homogeneous and points to the selection of clays, or better soils, derived from local Holocene Nile alluvia, with a composition very similar along the various sectors of the Nile river (D’Ercole and Sterba 2018). These ceramics were possibly tempered with some medium- and coarse-sized aeolian sand or with quartz grains drained by the local river systems. Technologically, the amount and type of the organic material added to the paste (more or less abundant and selected) makes the main difference and allows distinguishing among various sub-recipes or ways of doing the vessels. Further, the orientation of the voids left by the combustion of the organic matter into the paste permits to recognize among the use of different manufacturing techniques. Specifically, in the cooking pots with basketry impressions which were built on a mat, the organics appear generally well or moderately aligned with a prevalent presence of longitudinal features like stems or plant stalks (Fig. 2a). Differently, in those pots (e.g., globular pots, bowls) built with the coiling technique, the organics show mainly a poor alignment and a specific orientation that indicates the ‘relict’ coil features (Fig. 2b). The black topped and the fine polished Kerma ware generally contain less organics, these latter are also smaller in size indicating either the use of herbivore dung and/or a selection of added plant remains.

Figure 2a – Thin section scan of Sample DG-18 (Nubian cooking pot). The good alignment of the pores structures and of the voids and relicts left by the combustion of the organics indicates that this vessel was built on a mat. Image by G. D’Ercole.
Figure 2b – Thin section scan of Sample DG-17 (Nubian large bowl). The specific concentric alignment of the pores structures and of the voids and relicts left by the combustion of the organics indicates that this vessel was manufactured with the coiling technique. Image by G. D’Ercole.

Highly interesting in the sample from Dukki Gel, is the presence of a jar with a roughly polished / wet-smoothed black surface which although showing clear Nubian technological exterior features is characterized by a coarser and sandier fabric with more abundant feldspar and granitoid rock fragments resembling certain Egyptian cooking pots (Fig. 3). This sample, so far an unicum in our selection, points to an hybridization of Nubian and Egyptian traditions (this time with the intersection of some performance of ‘Egyptian’ criteria to a general Nubian technological and stylistical formula) and well supports our overall theoretical framework and working approach on the complexity and diversity among various Nubian local narrative experiences and conceptions of material culture.

Figure 3 – Sample DG-22 (Nubian jar) with roughly polished / wet-smoothed surfaces characterized by a sandy fabric rich in alkali feldspar. Photo by G. D’Ercole.

Hopefully by the end of this month, we also will have the first set of chemical data from the reference collection from Dukki Gel in our hands which we will then compare with the macroscopic evidence and with these petrographic remarks.

References

D’Ercole, G. In prep. Petrography of the pottery from the New Kingdom town of Sai, in: J. Budka, with contributions by G. D’Ercole, J. Sterba and P. Ruffieux, AcrossBorders 3: Vessels for the home away from Egypt. The pottery corpus from the New Kingdom town of Sai Island. Archaeology of Egypt, Sudan and the Levant. Vienna.

D’Ercole, G. and Sterba, J. H. 2018. From macro wares to micro fabrics and INAA compositional groups: the Pottery Corpus of the New Kingdom town on Sai Island (northern Sudan), 171–183, in: J. Budka and J. Auenmüller (eds.), From Microcosm to Macrocosm: Individual households and cities in Ancient Egypt and Nubia. Leiden.