WorldCat Identities

Schmidt, Patrick

Overview
Works: 8 works in 14 publications in 2 languages and 85 library holdings
Genres: Conference papers and proceedings 
Roles: Author
Publication Timeline
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Most widely held works by Patrick Schmidt
Le traitement thermique des matieres premieres lithiques : que se passe-t-il lors de la chauffe? by Patrick Schmidt( Book )

7 editions published in 2013 in French and held by 53 WorldCat member libraries worldwide

"This book looks at the transformations that intentional heat treatment causes in silica rocks when used as lithic raw material. Heat treatment, known from the Middle Stone Age on, is an important step in the evolution of techniques, and the way humans perceived the materials available to them. The study shows an experimental approach, not only to understanding what happens, but also to understanding the range of temperatures and heating speeds at which these transformations take place. The results yield quantitative data that help with the recognition of techniques and procedures that silica rocks, such as flint and other cherts, were subjected to in heat-treated processes."--Publisher's web site
Tempering-residue on heat-treated silcrete: an experimental perspective and a potential analytical protocol( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract: Silcrete heat treatment in the South African Middle Stone Age has been understood as a proxy for several key concepts in the evolution of early anatomically modern humans, although relatively little is yet known about the techniques and procedures used for it. Tempering-residue on heat-treated artefacts is one of the few known proxies for such a heating technique. It was reported to indicate heat treatment in open-air fires rather than in a sand-bath. There are however, several questions that need to be answered before tempering-residue can be used as an unambiguous proxy for heat treatment in open-air fires. These questions included: does it exclusively form in contact with embers? Is it only produced by green wood? We investigate the conditions under which tempering-residue forms using an experimental approach and wood from the zone of natural silcrete occurrence in South Africa. Our results confirm earlier publications by highlighting that tempering-residue only forms during heat treatment in direct contact with embers. Moreover, it indicates the use of green (not dried) wood in these fires. We also propose a potentially non-destructive analysis protocol for identifying tempering-residue on silcrete artefacts using infrared and Raman spectroscopy. The implications of these results for our understanding of early stone heat treatment and Middle Stone Age archaeology in general are highlighted by the ongoing debate about technical complexity, required investment and modern behaviours of early Homo sapiens . Highlights: Tempering-residue only forms during heat treatment in direct contact with embers Only green, freshly cut, wood produces tempering residue Tempering residue is not produced by sand-bath heat treatment Combined IR and Raman spectroscopy identify tempering residue non-destructively
Adoptive T-Cell Therapy of Melanoma: Promises and Challenges by Patrick Schmidt( Book )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

The MSA sequence of Diepkloof and the history of southern African late Pleistocene populations by Guillaume Porraz( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Crystallographic and structural transformations of sedimentary chalcedony in flint upon heat treatment by Patrick Schmidt( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

A previously undescribed organic residue sheds light on heat treatment in the Middle Stone Age by Patrick Schmidt( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

 
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.78 (from 0.04 for Medien des ... to 0.99 for Crystallog ...)

Alternative Names
Patrick Schmidt deutsch-französischer Archäologe

Patrick Schmidt German-French archaeologist

Languages