Timing of mammal-like reptile extinctions across the Permian-Triassic boundary in South Africa

The rate, timing, and pattern of change in different regions and paleoenvironments are critical for distinguishing among potential causes for the Permian-Triassic (P-T) extinction. Carbon isotopic stratigraphy can provide global chronostratigraphic control. We report a large δ13C excursion at the P-...

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Published in:Geology (Boulder) 2000-03, Vol.28 (3), p.227-230
Main Authors: MacLeod, Kenneth G, Smith, Roger M. H, Koch, Paul L, Ward, Peter D
Format: Article
Language:English
Subjects:
affinities
Africa
assemblages
biozones
bones
C-13/C-12
calcite
carbon
carbonates
chemostratigraphy
Chordata
diagenesis
Dicynodontia
Endangered & extinct species
extinction
isotope ratios
isotopes
Karoo Basin
Lower Triassic
Lystrosaurus
Mammalia
Mesozoic
O-18/O-16
oxygen
paleoecology
Paleontology
Paleozoic
Permian
Permian-Triassic boundary
Reptiles & amphibians
Reptilia
South Africa
Southern Africa
stable isotopes
stratigraphic boundary
Stratigraphy
Synapsida
Tetrapoda
Therapsida
Triassic
Upper Permian
Vertebrata
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creator MacLeod, Kenneth G
Smith, Roger M. H
Koch, Paul L
Ward, Peter D
description The rate, timing, and pattern of change in different regions and paleoenvironments are critical for distinguishing among potential causes for the Permian-Triassic (P-T) extinction. Carbon isotopic stratigraphy can provide global chronostratigraphic control. We report a large δ13C excursion at the P-T boundary and no long-term Permian δ13C trends for samples from the interior of Pangea. Stratigraphic gaps between available samples limit the resolution of our δ13C curve, but the excursion is within a 15-m-thick zone of overlap between Permian and Triassic taxa. Sedimentological and taphonomic observations demonstrate that this 15 m interval does not represent geologically instantaneous deposition. Together these data support a rapid and globally synchronous P-T event, but suggest that it occurred over a geologically resolvable interval of time.
doi_str_mv 10.1130/0091-7613(2000)28<227:TOMREA>2.0.CO;2
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ispartof Geology (Boulder), 2000-03, Vol.28 (3), p.227-230
issn 0091-7613
1943-2682
language eng
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source GeoScienceWorld
subjects affinities
Africa
assemblages
biozones
bones
C-13/C-12
calcite
carbon
carbonates
chemostratigraphy
Chordata
diagenesis
Dicynodontia
Endangered & extinct species
extinction
isotope ratios
isotopes
Karoo Basin
Lower Triassic
Lystrosaurus
Mammalia
Mesozoic
O-18/O-16
oxygen
paleoecology
Paleontology
Paleozoic
Permian
Permian-Triassic boundary
Reptiles & amphibians
Reptilia
South Africa
Southern Africa
stable isotopes
stratigraphic boundary
Stratigraphy
Synapsida
Tetrapoda
Therapsida
Triassic
Upper Permian
Vertebrata
title Timing of mammal-like reptile extinctions across the Permian-Triassic boundary in South Africa
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