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Archaeological and Anthropological Sciences

, Volume 11, Issue 12, pp 6803–6827 | Cite as

Documenting the degradation of animal-tissue residues on experimental stone tools: a multi-analytical approach

  • Gilliane MonnierEmail author
  • Kaitlyn May
Original Paper

Abstract

In lithic residue analysis, the identification of degraded animal tissues on stone tools is challenging due to many factors, not least of which is the fact that residues are complex, heterogeneous mixtures of many different kinds of molecules. In order to aid in their identification, a reference library of infrared spectra of residues collected using Fourier-transform infrared microspectroscopy (FTIRM) has recently been published (Monnier et al J Archaeol Sci: Rep 18:806–823, 2018). The goal of the present study is to explore the effects of decomposition on residues. Accordingly, we buried flakes with residues in compost for 1 year, then excavated them and documented both their appearance (using visible-light microscopy (VLM) and scanning electron microscopy (SEM)) and molecular composition (using FTIRM). The results show that while some residues (like meat and blood) disappeared entirely, others (fat and skin) were preserved on the bottoms of flakes buried in deep layers within the compost. Although the residues were damaged by microbial activity, their FTIRM spectra were clearly interpretable. Residues containing hydroxyapatite (bone and fish scales) and keratin (feather barbules, hair, and skin) were relatively well preserved. Their structures were in many cases recognizable, and their FTIRM spectra were entirely consistent with the FTIRM spectra of the standards. The results of the experiment show that the decay of animal tissues in compost proceeds primarily as a result of microbial activity, which appears to remove the tissues before they have a chance to oxidize or experience other biochemical changes. We conclude that if ancient residues have not been removed by microbial action, they can be identified using FTIR standards based upon fresh residues, such as those published in Monnier et al J Archaeol Sci 78:158–178, (2017), Monnier et al. 2018, J Archaeol Method Theory 25(1):1-44.

Keywords

Residue analysis FTIR microspectroscopy SEM Stone tools Residue degradation 

Notes

Acknowledgements

This work was funded by NSF grant # BCS-1420702. It was carried out at the University of Minnesota in the Evolutionary Anthropology Laboratories (College of Liberal Arts); at the Advanced Imaging Service for Objects and Spaces (AISOS) in the College of Liberal Arts; at the Characterization Facility (College of Science and Engineering), which receives partial support from the NSF through the MRSEC program; and at LacCore: National Lacustrine Core Facility (College of Science and Engineering), which receives partial support from the NSF. We wish to thank the many people at these centers who helped us along the way: Gil Tostevin, Matt Edling, Samantha Porter, Colin McFadden, Bing Luo, Kristina Brady Shannon, and Amy Myrbo. Many thanks go to Edward Idarraga for his help with the figures, and we thank two anonymous reviewers for their helpful comments.

Author roles

The study was designed and implemented by GM; photographs, VLM images, and SEM images were collected by GM and KM; FTIRM spectra were collected by GM; data analysis, manuscript writing, and figures were accomplished by GM.

Supplementary material

12520_2019_941_MOESM1_ESM.pdf (880 kb)
ESM 1 (PDF 880 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of AnthropologyUniversity of MinnesotaMinneapolisUSA

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