The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections
Re-examination of 149 IPG Group I (119), Group Ia (17) and Groups III and IIa (13) axe petrographic thin-sections in a short period of time resulted in 24 sub-groups being identified, each sharing distinct petrographic features. Approximately 5% (8 thin-sections) had distinctive mineralogy, differen...
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ftdoajarticles:oai:doaj.org/article:de9bf2b3d3d6490f854ff723ddd10eeb 2024-02-04T10:01:59+01:00 The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections Mik Markham 2009-09-01T00:00:00Z https://doaj.org/article/de9bf2b3d3d6490f854ff723ddd10eeb EN eng University of York http://intarch.ac.uk/journal/issue26/markham_index.html https://doaj.org/toc/1363-5387 10.11141/ia.26.23 1363-5387 https://doaj.org/article/de9bf2b3d3d6490f854ff723ddd10eeb Internet Archaeology, Iss 26 (2009) archaeology petrography thin-sections Neolithic axes greenstone Cornwall quantitative analysis CC1-960 article 2009 ftdoajarticles 2024-01-07T01:47:05Z Re-examination of 149 IPG Group I (119), Group Ia (17) and Groups III and IIa (13) axe petrographic thin-sections in a short period of time resulted in 24 sub-groups being identified, each sharing distinct petrographic features. Approximately 5% (8 thin-sections) had distinctive mineralogy, different from that of altered dolerite (greenstone), which defines these IPG Groups. All 149 thin-sections are visually compared with 73 new petrological thin-sections that were produced from 13 greenstone exposures in North and South Cornwall. The closest petrological match between axe and greenstone suggests Mounts Bay, possibly Long Rock. Mousehole and Penlee exposures may be the source of material for some of the 24 sub-groups. Two greenstone samples found in north-west Cornwall, away from known exposures, provided the closest petrographic match found between axe and rock thin-sections. This supports Keiller et al. (1941) in their assumption that IPG Group I originates from Mounts Bay, but indicates it is unlikely that a single exposure provided the material for all IPG Group I axes. Further analysis using a novel quantitative technique supports the results of the visual examination and may prove to be the basis of a future tool to be used in recording and assigning Neolithic axes to IPG Groups. Article in Journal/Newspaper Long Rock Directory of Open Access Journals: DOAJ Articles Cornwall ENVELOPE(-59.688,-59.688,-62.366,-62.366) Long Rock ENVELOPE(-61.198,-61.198,-62.689,-62.689) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
archaeology petrography thin-sections Neolithic axes greenstone Cornwall quantitative analysis CC1-960 |
spellingShingle |
archaeology petrography thin-sections Neolithic axes greenstone Cornwall quantitative analysis CC1-960 Mik Markham The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections |
topic_facet |
archaeology petrography thin-sections Neolithic axes greenstone Cornwall quantitative analysis CC1-960 |
description |
Re-examination of 149 IPG Group I (119), Group Ia (17) and Groups III and IIa (13) axe petrographic thin-sections in a short period of time resulted in 24 sub-groups being identified, each sharing distinct petrographic features. Approximately 5% (8 thin-sections) had distinctive mineralogy, different from that of altered dolerite (greenstone), which defines these IPG Groups. All 149 thin-sections are visually compared with 73 new petrological thin-sections that were produced from 13 greenstone exposures in North and South Cornwall. The closest petrological match between axe and greenstone suggests Mounts Bay, possibly Long Rock. Mousehole and Penlee exposures may be the source of material for some of the 24 sub-groups. Two greenstone samples found in north-west Cornwall, away from known exposures, provided the closest petrographic match found between axe and rock thin-sections. This supports Keiller et al. (1941) in their assumption that IPG Group I originates from Mounts Bay, but indicates it is unlikely that a single exposure provided the material for all IPG Group I axes. Further analysis using a novel quantitative technique supports the results of the visual examination and may prove to be the basis of a future tool to be used in recording and assigning Neolithic axes to IPG Groups. |
format |
Article in Journal/Newspaper |
author |
Mik Markham |
author_facet |
Mik Markham |
author_sort |
Mik Markham |
title |
The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections |
title_short |
The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections |
title_full |
The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections |
title_fullStr |
The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections |
title_full_unstemmed |
The Devil's in the Detail: A review of Group I and III Petrographic Thin-Sections |
title_sort |
devil's in the detail: a review of group i and iii petrographic thin-sections |
publisher |
University of York |
publishDate |
2009 |
url |
https://doaj.org/article/de9bf2b3d3d6490f854ff723ddd10eeb |
long_lat |
ENVELOPE(-59.688,-59.688,-62.366,-62.366) ENVELOPE(-61.198,-61.198,-62.689,-62.689) |
geographic |
Cornwall Long Rock |
geographic_facet |
Cornwall Long Rock |
genre |
Long Rock |
genre_facet |
Long Rock |
op_source |
Internet Archaeology, Iss 26 (2009) |
op_relation |
http://intarch.ac.uk/journal/issue26/markham_index.html https://doaj.org/toc/1363-5387 10.11141/ia.26.23 1363-5387 https://doaj.org/article/de9bf2b3d3d6490f854ff723ddd10eeb |
_version_ |
1789968266887692288 |