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

ABSTRACT It is widely accepted that most larger Australian vertebrates were extinct by 40 ka. The reliability of

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Published in:Journal of quaternary science 2015-05, Vol.30 (4), p.355-364
Main Authors: MCDOWELL, MATTHEW C., PRIDEAUX, GAVIN J., WALSHE, KERYN, BERTUCH, FIONA, JACOBSEN, GERALDINE E.
Format: Article
Language:English
Subjects:
Age
Australia
Bones
Charcoal
Chronology
extinction
Fossils
Islands
Kangaroo Island
Mammals
megafauna
palaeoenvironment
radiocarbon dating
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container_issue 4
container_start_page 355
container_title Journal of quaternary science
container_volume 30
creator MCDOWELL, MATTHEW C.
PRIDEAUX, GAVIN J.
WALSHE, KERYN
BERTUCH, FIONA
JACOBSEN, GERALDINE E.
description ABSTRACT It is widely accepted that most larger Australian vertebrates were extinct by 40 ka. The reliability of
doi_str_mv 10.1002/jqs.2789
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The reliability of &lt;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. 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Quaternary Sci</addtitle><description>ABSTRACT It is widely accepted that most larger Australian vertebrates were extinct by 40 ka. The reliability of &lt;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. 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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. Copyright © 2015 John Wiley &amp; Sons, Ltd.</abstract><cop>Chichester</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/jqs.2789</doi><tpages>10</tpages></addata></record>
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subjects Age
Australia
Bones
Charcoal
Chronology
extinction
Fossils
Islands
Kangaroo Island
Mammals
megafauna
palaeoenvironment
radiocarbon dating
title Re-evaluating the Late Quaternary fossil mammal assemblage of Seton Rockshelter, Kangaroo Island, South Australia, including the evidence for late-surviving megafauna
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