Ptghni

A new obsidian source in the Hrazdan River basin, Armenia

Ellery Frahm, Keith N. Wilkinson, Emily J. Beverly, Daniel S. Adler, Boris Gasparyan, Jenni Sherriff

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Here we report our recent discovery of a new obsidian source in central Armenia. Using portable XRF, we were able to chemically identify “Ptghni” obsidian as a previously unrecognized source on the same day that we first encountered it during our field surveys. Obsidian was found in alluvial-lacustrine sediments exposed within the Hrazdan Gorge, where it had been deposited after having eroded from an upstream source. These sediments were covered by mafic lavas and later exposed by downcutting of the Hrazdan River. Based on the stratigraphy of the gorge, the lava flows – and, therefore, the sediments sandwiched between them – predate 441 ka. The composition of Ptghni obsidian does not fit into the chemical trends of known sources in the Gegham and Tsaghkunyats ranges, so its precise volcanic origin remains unknown. Comparisons to unidentified artifacts in the literature revealed no matches, but obsidian sourcing work in Armenia has largely focused on the Holocene, when the Ptghni source might no longer have been accessible. The discovery of Ptghni obsidian is crucial for research into early hominin expansions given that it was an obsidian source available for use as toolstone by hominins during the Early and/or Middle Pleistocene.

Original languageEnglish
Pages (from-to)55-64
Number of pages10
JournalJournal of Archaeological Science: Reports
Volume14
DOIs
Publication statusPublished - 1 Aug 2017

Keywords

  • Obsidian sourcing
  • Armenia
  • Ptghni

Cite this

Frahm, E., Wilkinson, K. N., Beverly, E. J., Adler, D. S., Gasparyan, B., & Sherriff, J. (2017). Ptghni: A new obsidian source in the Hrazdan River basin, Armenia. Journal of Archaeological Science: Reports, 14, 55-64. https://doi.org/10.1016/j.jasrep.2017.05.039
Frahm, Ellery ; Wilkinson, Keith N. ; Beverly, Emily J. ; Adler, Daniel S. ; Gasparyan, Boris ; Sherriff, Jenni. / Ptghni : A new obsidian source in the Hrazdan River basin, Armenia. In: Journal of Archaeological Science: Reports. 2017 ; Vol. 14. pp. 55-64.
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Frahm, E, Wilkinson, KN, Beverly, EJ, Adler, DS, Gasparyan, B & Sherriff, J 2017, 'Ptghni: A new obsidian source in the Hrazdan River basin, Armenia', Journal of Archaeological Science: Reports, vol. 14, pp. 55-64. https://doi.org/10.1016/j.jasrep.2017.05.039

Ptghni : A new obsidian source in the Hrazdan River basin, Armenia. / Frahm, Ellery; Wilkinson, Keith N.; Beverly, Emily J.; Adler, Daniel S.; Gasparyan, Boris; Sherriff, Jenni.

In: Journal of Archaeological Science: Reports, Vol. 14, 01.08.2017, p. 55-64.

Research output: Contribution to journalArticleResearchpeer-review

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Frahm E, Wilkinson KN, Beverly EJ, Adler DS, Gasparyan B, Sherriff J. Ptghni: A new obsidian source in the Hrazdan River basin, Armenia. Journal of Archaeological Science: Reports. 2017 Aug 1;14:55-64. https://doi.org/10.1016/j.jasrep.2017.05.039