Mathematics – Logic
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...233..984c&link_type=abstract
Science (ISSN 0036-8075), vol. 233, Aug. 29, 1986, p. 984-986. Research supported by the Chinese Academy of Sciences, DOE, and N
Mathematics
Logic
19
Biological Evolution, Fossils, Geochemistry, Iridium, Paleontology, China, Extinction, Marine Biology, Stratigraphy
Scientific paper
The Permian-Triassic sedimentary sequence of China includes one of the most complete and fossiliferous Paleozoic-Mesozoic boundaries known. Closely spaced sampling across the boundary, which is an important extinction event for most organisms, has produced good conodont faunas that show little diversity change. A drop in conodont abundance is the only apparent response to the extinction event. A low concentration of iridium in the boundary clay (0.002 part per billion + or - 20 percent), as well as in samples immediately below and above, that range from 0.004 to 0.034 part per billion do not support the proposal of an extraterrestrial impact event at this boundary in China.
Clark David L.
Gilmore James S.
Orth Carl J.
Wang Christina Yan
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