Research so far
Our previous research in the Tankwa Karoo took place within the framework of my PhD. This mapped surface artefacts through surveys to understand how people’s landscape- and tool-use varied across space and through time, over the past million years. As part of this, we dedicated 12 days to collecting information on artefacts at Tweefontein which, together with new data and approaches, will be central to the TANKwA project.
In 2015, Matthew Shaw and I carried out an attribute-based analysis of a sample of the artefacts at Tweefontein. This involved recording the individual features (attributes) of cores, points and other artefacts and taking precise measurements of various dimensions. A key aim was to ask whether what we thought looked like Nubian technology fitted with a thorough technological definition of it. To do this, we used a set of attributes set out by Vitaly Usik and colleagues when they asked the same questions of their Nubian-like artefacts in Arabia.
We were able to confirm that our sample of 120 cores follow coherent patterns, and these fit with features used elsewhere to define Nubian technology. More details will be available when this research is published.
A new approach
An attribute-based analysis is advantageous in many ways as it provides a scientific way of comparing artefacts within an assemblage (at one site), and between different assemblages (at other sites), using the same classification system and measurements. However, certain important characteristics of an artefact are not captured very well in this method – particularly, shape. Rather than simply describing a shape, new digital methods allow us to easily quantify and compare shapes using a technique called geometric morphometrics.
Geometric morphometric (GM) analysis is a way of studying shape using Cartesian landmarks (x, y, z co-ordinates of a point in space) and applying certain statistical methods to compare how the geometry (distances, angles, positions) of these shapes vary. It is widely used in the biological sciences for looking at shape variation in cells, bones, teeth, flowers – essentially anything where you are interested in understanding the relationships between shape and size.
Scientists are increasingly using GM in anthropology to study human bones and fossils to answer questions about evolutionary development and variation, and in archaeology to look at objects. Specific software has been developed to apply these methods to archaeological artefacts such as stone tools, with built-in statistics to answer archaeologically-relevant questions.
We will use photogrammetry to capture artefacts in 3D and use the software AGMT3-D to study shape variation at Tweefontein and other relevant sites. A major advantage of this method is that we can photograph our artefacts in the field using a simple camera and turntable set-up, then use software to stitch them together into a 3D model for analysis. We can leave the artefacts exactly where we found them, and study them from a computer or even print them in 3D.
By combining traditional methods of technological and attribute analysis with innovative 2D and 3D GM methods, we will be able to better understand both the Nubian cores and points at Tweefontein, and Levallois point technology in a wider context.
Our new fieldwork aims to:
- Sample a larger area of the Tweefontein site and carry out 3D photogrammetry on artefacts in the field,
- Excavate small test-pits to better understand the formation of the site and its desert pavement context,
- Revisit two other small nearby sites from our previous surveys and record Nubian cores and points in 3D for comparison,
- Carry out more surveys to see whether other sites like Tweefontein exist in the surrounding landscape.
In addition to our local-scale observations for the Tankwa Karoo, cores and points from several other sites in South Africa and Israel will be studied for regional and global comparisons, using the same methods.
Workshop for researchers
A workshop will be held at ICArEHB in Faro, Portugal, in 2021 or 2022 to enable researchers working on Nubian technology and related areas to discuss the results of the TANKwA project, share methods, and compare ideas. Its aim will be to facilitate discussion on how we can approach the study of Nubian technology globally to better understand past human behaviour and adaptations.
We will continue to collaborate with our friends at the charity Children’s Book Network in South Africa, running creative and fun educational workshops for children in South Africa. We will also develop educational ‘tool-boxes’ with CBN containing relevant reading material and 3D-printed artefacts to reach wider audiences in Africa and Europe.
Overall aims of TANKwA
The research objectives of the project are:
- To test the hypothesis that Nubian technology was an adaptive response to arid conditions in southern Africa,
- To establish a methodological protocol for using attribute and 3D data to study Nubian technology and point production,
- To contextualise the technology of Tweefontein within our understanding of the southern African MSA,
- To contextualise technology at Tweefontein within the global framework of Nubian technology.
This project is funded by the EU and runs from 1 June 2020 until 31 May 2022.
Please contact me if you have any questions about the research or if you are interested in collaborating.