Pectinoid bivalves of the Permian-Triassic crisis. Bulletin of the AMNH ; no. 227

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dc.contributor.authorNewell, Norman Dennis, 1909-en_US
dc.contributor.authorBoyd, Donald Wilkin.en_US
dc.date.accessioned2005-11-22T22:59:06Z
dc.date.available2005-11-22T22:59:06Z
dc.date.issued1995en_US
dc.description95 p. : ill., maps ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 87-95).en_US
dc.description.abstract"This contribution concludes a general revision of genera of pectiniform bivalves (pectinoids) of the world's marine rocks near the Permo-Triassic boundary. The study includes the morphology, taxonomy, and distribution of some 20 families and 30 genera, several of them new (for new taxa see Contents). It is based on the best material available anywhere, mainly from the western United States. The known diversity of these early pectinoids declined gradually from about 23 genera in the Guadalupian (M. Permian) to a minimum of 5 in the Griesbachian (L. Triassic). After the biological decline, they did not recover substantial diversity until late Triassic (Norian) time. So they shared the great mass extinction with most other groups of marine invertebrates. The crisis extended over some tens of millions of years and was slow, rather than catastrophic. This diversity pattern agrees well with carbon isotope ratios that seem to reflect a depressed oceanic productivity in early Triassic time"--P. 5.en_US
dc.format.extent37466340 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/1667
dc.languageengen_US
dc.language.isoen_US
dc.publisher[New York] : American Museum of Natural Historyen_US
dc.relation.ispartofseriesBulletin of the American Museum of Natural History ; no. 227en_US
dc.subject.lccQH1 .A4 no.227, 1995en_US
dc.subject.lcshPectinoida.en_US
dc.subject.lcshBivalvia, Fossil.en_US
dc.subject.lcshPaleontology -- Permian.en_US
dc.subject.lcshPaleontology -- Triassic.en_US
dc.titlePectinoid bivalves of the Permian-Triassic crisis. Bulletin of the AMNH ; no. 227en_US
dc.typetexten_US

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