La Trobe

Mapping magnetism: Geophysical modelling of stratigraphic features by using in situ magnetic susceptibility measurements at Pinnacle Point 5-6 North, South Africa

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posted on 2023-07-28, 04:46 authored by A Dinckal, EC Fisher, Andrew HerriesAndrew Herries, CW Marean
This study utilizes geostatistical modelling of magnetic susceptibility (MS) for geophysical prospection of archaeological stratigraphy at the Middle Stone Age rock shelter site of Pinnacle Point 5-6 North. These models are overlaid onto high-resolution photography of the stratigraphic sequence to study the lateral and vertical changes within the magnetic signature of the archaeological sequence and correlate these changes to micromorphological interpretations previously made at the site. In situ analysis is reinforced by laboratory magnetic mineralogical analysis utilizing MS; frequency-dependent susceptibility (χFD); isothermal remanent magnetization; and anhysteric remanent magnetization to understand the composition of the magnetic minerals creating the in situ signature. This study shows that there is consistent variation in the magnetic signatures of the sequence that can be mapped with in situ MS; there is a correlation with laboratory analysis of magnetic mineralogy, which provides insight into changes in human behaviour; and our models correlate well with micromorphological interpretations of the site.

Funding

John Templeton Foundation; Insitute of Human Origins (IHO); Australian Research Council; Hyde Family Foundation; National Science Foundation.

History

Publication Date

2022-11-01

Journal

Geoarchaeology

Volume

37

Issue

6

Pagination

(p. 840-857)

Publisher

Wiley

ISSN

0883-6353

Rights Statement

© 2022 The Authors. Geoarchaeology published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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