Robert Z Selden Jr, lithics, stone tools, biface, Gahagan, Gahagan Mound, Caddo, Louisiana, archaeology, archeology, illustration, flake scar, geometric morphometrics, shape, form, allometry, asymmetry

TAS Blog Post on Gahagan Biface Shape

A blog post associated with a project that John E. Dockall and I have been working on was recently added to the Texas Archeological Society’s website, and can be viewed here –https://www.txarch.org/tas-blog/gahagan-biface-morphology-in-the-southern-caddo-area.

Illustrations of Gahagan bifaces from the Gahagan Mound site in Northwest Louisiana. We are now looking at flake scar and beveling morphology associated with Gahagan biface retouch and refurbishment by Caddo knappers.

The post provides a preview of morphological similarities and differences associated with Gahagan bifaces found in Caddo burial contexts, which are currently thought to have been produced in central Texas. The preprint has been uploaded to SSRN and SocArXiv while the associated article is in review. Links to the SocArXiv preprint and other readings associated with this project are included below.

Preprint of 2019 article:

Selden Jr., Robert Z. and John E. Dockall. 2019. “A Comparison of Gahagan Biface Morphology across Caddo Features at the Gahagan Mound, George C. Davis, and Mounds Plantation Sites.” SocArXiv https://doi.org/10.31235/osf.io/fyw2d

2019 Conference poster:

Selden Jr., Robert Z., John E. Dockall, and Harry J. Shafer. 2019. “Lithic Morphological Organization: Gahagan Bifaces from Texas and Louisiana.” Stephen F. Austin State University, accessed March 1, 2019. https://scholarworks.sfasu.edu/crhr/266/

2018 DAACH article and preprint:

Selden Jr., Robert Z., John E. Dockall, and Harry J. Shafer. 2018. “Lithic Morphological Organisation: Gahagan Bifaces from the Southern Caddo Area.” Digital Applications in Archaeology and Cultural Heritage 10:e00080. https://doi.org/10.1016/j.daach.2018.e00080

Selden Jr., Robert Z., John E. Dockall, and Harry J. Shafer. 2018. “Lithic Morphological Organisation: Gahagan Bifaces from the Southern Caddo Area.” SocArXiv https://doi.org/10.31235/osf.io/u7qfr

robert z selden jr, caddo, archaeology, biface, george c davis, caddo mounds state historic site, nagpra, museum studies, lithic, stone tool, archaeology, culture heritage, cultural heritage, history

Preprint available for study of Gahagan biface morphology

New paper in-press at Digital Applications in Archaeology and Cultural Heritage with John Dockall and Harry Shafer on the morphological variability of Gahagan bifaces. View and download the preprint here, or by clicking on the image below.

Abstract

This analysis of Gahagan biface morphology enlists the three largest samples of Gahagan bifaces, to include that of the type site (Gahagan Mound) as well as the Mounds Plantation and George C. Davis sites. Results indicate a significant difference in Gahagan biface morphology at the Mounds Plantation site when compared with Gahagan bifaces from the Gahagan Mound and George C. Davis sites. Tests for allometry and asymmetry were not significant. The test of morphological disparity indicates that Gahagan bifaces produced at the Mounds Plantation site occupy a more restricted range of morphospace than those produced at Gahagan Mound, providing evidence for standardisation and diversity in Caddo biface production. While the sample includes a wide range of variability, the test of morphological integration indicates that Gahagan bifaces are significantly integrated, meaning that those traits used to characterise their shape (blade and base) vary in a coordinated manner. These results articulate with a shift in Caddo bottle morphology over the same geography, potentially indicating two previously unrecognised and morphologically-distinct lithic and ceramic production areas.

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projectile point, dart point, clovis, gainey, 3d, 3d scan, 3d model, geomagic design x, geomagic control x, analysis, geometric morphometrics, 3d geometric morphometrics, archaeology, archeology

Paleoindian Archaeology and the Index of Texas Archaeology

New article published in PaleoAmerica discussing some of the Paleoindian resources available on the Index of Texas Archaeology (https://www.tandfonline.com/doi/abs/10.1080/20555563.2018.1467686?journalCode=ypal20#metrics-content).

(2018). Paleoindian Archaeology and the Index of Texas Archaeology. PaleoAmerica: Vol. 4, No. 2, pp. 95-98.

Paleoindian Archaeology and the Index of Texas Archaeology

Source: Paleoindian Archaeology and the Index of Texas Archaeology

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robert z selden jr, blackwater draw, clovis, agate basin, 3d, 3d scan, 3d model, projectile point, dart point, new mexico, culture, history, prehistory, heritage

3D Scan Data for Selected Artifacts from Blackwater Draw National Historic Landmark

Between February 8-11, 2016, selected artifacts from the Blackwater Draw National Historic Landmark (LA3324) were scanned in advance of a grant proposal to digitally aggregate the Clovis-era artifacts from the Clovis type site. These data were collected using a NextEngineHD running ScanStudioHD Pro, and post-processed in Geomagic Design X 2016.0.1. All data associated with this project are publicly available (open access) and accessible in Zenodo under a Creative Commons Attribution license, where they can be downloaded for use in additional projects and learning activities. These data have the capacity to augment a variety of research designs spanning the digital humanities, applications of geometric morphometrics, and many others. Additionally, these scans will augment a wide range of comparative research topics throughout the Americas and beyond. Reuse potential for these data is significant.

Unprocessed 3D data are included on the landing page, and links to the processed files are included in the data paper. Download the data paper here:: 3D Scan Data for Selected Artifacts from Blackwater Draw National Historic Landmark

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robert z selden jr, gault, clovis, 3d, 3d scan, 3d model, projectile point, dart point, texas, culture, history, prehistory, heritage

Preprint available on SocArXiv

Now available on SocArXiv – download here. The paper includes a 3D figure–preprint must be downloaded then opened in your PDF viewer to activate the 3D model. Learn more about how to interact with a 3D PDF here. Many thanks to the folks at the Open Science Framework, SocArXiv and Overleaf. This data paper is currently in review.

DOI 10.17605/OSF.IO/9YD7J | ARK c7605/osf.io/9yd7j

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