robert z selden jr, geometric morphometrics, ceramics, pottery, shape analysis, geomorph, r, Caddo, American Southeast, archaeology, https://doi.org/10.1016/j.jasrep.2018.08.045

Preprint of new JAS: Reports article available on SocArXiv

The geometric morphometric analysis of Hickory Engraved bottles is currently in press at JAS: Reports, and the preprint is available for download on SocArXiv. The follow-up to this piece integrates a new sample of Smithport Plain Caddo bottles, and will be published in Volume 89 of the Bulletin of the Texas Archeological Society. The Hickory Engraved analysis presents an iterative extension of my ongoing work with Caddo ceramic morphology, to which new collections are regularly added. Access the preprint by clicking on the SocArXiv link above, or on the images below.

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Comparison of mean shapes for sites where Hickory Engraved assemblages were found to differ significantly; a, Gahagan Mound (gray) and Belcher Mound; b, Gahagan Mound (gray) and Crenshaw Mound; c, Gahagan Mound (gray) and Haley Place; d, Gahagan Mound (gray) and Paul Mitchell; e, Gahagan Mound (gray) and Pohler Collection; f, Smithport Landing (gray) and Paul Mitchell; and g, Smithport Landing (gray) and Pohler Collection.

This study expands upon a previous analysis of the Clarence H. Webb collection that resulted in the identification of two bottle shapes used in the manufacture of the Hickory Engraved type. The current sample of Caddo bottles adduces three-dimensional meshes from the Hickory Engraved specimens in the Webb collection, and 14 new meshes from six sites and one collection. Results confirm that in some cases Hickory Engraved bottle shapes differ significantly by site, that the two shapes identified in the Webb collection persist in this larger sample, and that morphological integration is not significant, meaning that those traits used to characterise bottle shape (rim, neck, body, and base) were not found to vary in a coordinated manner. Thus, these results do not support the hypothesis that Caddo potters adhered to a template of vessel shape associated with specific decorative motifs. When combined with the Webb sample, iterative improvements are achieved, and results demonstrate a general trend toward standardisation in Caddo bottle shapes through time.

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Comparison of mean bottle shapes by type for those types found to differ significantly in the Hickory Engraved study; (a) Belcher Engraved (gray) and Hickory Engraved, (b) Belcher Engraved (gray) and Keno Trailed, (c) Belcher Engraved (gray) and Smithport Plain, (d) Hickory Engraved (gray) and Keno Trailed, (e) Hickory Engraved (gray) and Smithport Plain, (f) Keno Trailed (gray) and Smithport Plain, (g) Keno Trailed (gray) and Taylor Engraved, and (h) Smithport Plain (gray) and Taylor Engraved.

Funding for this research was provided by the Caddo Nation of Oklahoma and the National Center for Preservation Technology and Training.

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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

Lithic morphological organisation: Gahagan bifaces from the Southern Caddo Area

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 – https://doi.org/10.1016/j.daach.2018.e00080.

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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robert z selden jr, computer aided inspection, human mandible, sudan, ct scan, 3d scan, 3d model, 3d surface model, nurbs, deviation, geomagic design x, geomagic control x, sudan, university of colorado boulder, heritage, culture, geometric morphometrics

Advanced 3D Imaging and Morphometrics for Archaeologists

I will be teaching a section of the National Center for Preservation Technology and Training’s Advanced 3D Imaging and Morphometrics for Archaeologists workshop from October 15 – 18, 2018 in the Conservation Laboratory at the Arizona State Museum, on the campus of the University of Arizona.

Other instructors include Bernard K. Means, Loren Davis, and Michael Shott who will be discussing public archaeology and outreach, 3D projectile point analysis, and theory and methods, respectively.

robert z selden jr, archaeology, archeology, geometric morphometric, ceramic, analysis, mathematics, statistics, 3d, 3d scan

The objective of this workshop is to share and discuss the latest uses of 3D imaging of archaeological artifacts in order to improve the utility and precision of analyses that employ 3D data to assess morphological variation. Additional discussions will cover topics related to digital curation and public archaeology, where the utility of 3D scans reach beyond traditional analyses. To accomplish this, we are bringing together selected experts to one location to share their expertise. This four-day event will include lectures, a hands-on practicum, data analysis demonstrations, and discussions of best practices and data curation.

robert z selden jr, caddo, archaeology, ceramic, pot, pottery, geometric morphometrics, shape, size, form, allometry, asymmetry, geomagic design x, culture, heritage, history, museum studies

Find more information, and to register to attend the workshop, click here or follow this link – https://www.ncptt.nps.gov/events/advanced-3d-imaging-and-morphometrics-for-archeologists/.

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Preprint of New BTAS Article Available on SocArXiv

The preprint of my forthcoming BTAS article that explores morphological variation for a sample of Smithport Plain Caddo bottles is now available for download on SocArXiv. The follow-up to this piece integrates Caddo bottles from the Bison B site in northwest Louisiana curated at Southern Methodist University. This analysis is an iterative extension of my ongoing work with Caddo ceramic morphology, to which new collections are regularly added. Each iterative improvement includes an analysis of the recently scanned ceramics, then presents the results of a subsequent analysis of the aggregated sample.

 

A Preliminary Study of Smithport Plain Bottle Morphology in the

 

Many thanks to the Caddo Nation of Oklahoma, the Williamson Museum at Northwestern State University, the Louisiana State Exhibit Museum, the Texas Archeological Research Laboratory, and the Louisiana State University (LSU) Museum of Natural Science for the requisite permissions and access needed to generate the 3D scans of the Caddo bottles used in this analysis. Development of the analytical workflow and production of 3D scans from the Clarence H. Webb collection was funded by a grant (P14AP00138) from the National Center for Preservation Technology and Training. Production of 3D scans for repatriated Caddo bottles from the Crenshaw Mound and the Pohler Collection was funded by a grant from the Caddo Nation of Oklahoma.

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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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