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Re-evaluating the Late Quaternary fossil mammal assemblage of Seton Rockshelter, Kangaroo Island, South Australia, including the evidence for late-surviving megafauna

journal contribution
posted on 2023-05-20, 09:42 authored by Matthew McDowell, Prideaux, GJ, Walshe, K, Bertuch, F, Jacobsen, GE
It is widely accepted that most larger Australian vertebrates were extinct by 40 ka. The reliability of <20‐ka radiocarbon (14C) ages on charcoal stratigraphically associated with sthenurine (short‐faced) kangaroo tooth fragments from Seton Rockshelter, Kangaroo Island, have therefore proven contentious. Some researchers have argued these fossils were in situ, while others have claimed they were reworked. To address this we obtained new 14C ages on bones from the site. These bone ages are not only consistent with earlier charcoal ages, but are in near‐perfect stratigraphic order, providing strong support for the site's stratigraphic integrity. Our analyses indicate units aged 21−17 ka were primarily accumulated by Tasmanian devils (Sarcophilus harrisii) and owls (Tyto species), after which humans became the primary accumulation agent. The tight chronology, faunal trends and current lack of evidence for older layers from which specimens could have been reworked suggest the sthenurine remains may be in situ. However, because attempts to directly date sthenurine material failed, we cannot confidently assert that they survived to this time. Therefore, Seton Rockshelter may be best excluded from the Pleistocene extinction debate until the site can be re‐excavated and more conclusive evidence collected, including more complete or directly datable sthenurine remains.

History

Publication title

Journal of Quaternary Science

Volume

30

Issue

4

Pagination

355-364

ISSN

0267-8179

Department/School

School of Natural Sciences

Publisher

John Wiley & Sons Ltd

Place of publication

The Atrium, Southern Gate, Chichester, England, W Sussex, Po19 8Sq

Rights statement

Copyright 2015 John Wiley & Sons, Ltd.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the biological sciences; Expanding knowledge in history, heritage and archaeology

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