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Nearshore Marine Paleoclimatic Regions, Increasing Zoogeographic Provinciality, Molluscan Extinctions, and Paleoshorelines, California: Late Oligocene (27Ma) to late Pliocene (2.5 Ma)

Product Code: USPE357
Series: GSA Special Papers
Author/Editor: Clarence A. Hall, Jr.
Publication Date: 13 July 2001
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Special offer price £17.00 (usual price £48 / GSA&GSL £33.60)

GSA Special Paper 357.

Approximately 3000 middle and late Cenozoic nearshore marine molluscan taxa from western California are assigned to six time periods, spanning ~25 m.y. In this interdisciplinary study, western California is palinspastically restored for each of the time periods by backsliding and back-rotating large fault blocks or crustal units. Marine fossil assemblages are assigned to nearshore paleoclimatic regions or water masses within palinspastically restored California. In addition, this volume reveals positive feedback mechanisms between paleolatitudinal changes in sea-surface paleotemperature gradients and changes in the diversity of marine mollusks along the California coast through time; defines “equable” based effective temperatures; and analyzes extinction rates among macroinvertebrate marine taxa from coastal California and the possible causes of these extinctions. The late Paleogene to Neogene faunas reflect an increase in faunal diversity related to strengthened temperature gradients, greater extremes in sea-surface temperatures, reduction in temperateness, and the development of an embayed California coastline.

Type: Book
Ten Digit ISBN: 0-8137-2357-4
Thirteen Digit ISBN: 978-0-8137-2357-0
Publisher: GSA
Pages: 496
Weight: 2.85 kg


ABSTRACT • INTRODUCTION • PROCEDURE, Assigning rock units to time slices • Taxonomy and latitudinal endpoints of taxa • Effective temperature • Paleoshorelines and paleoclimatic regions • Assignment of rock units to time slices • Molluscan stages, Biostratigraphic problems • Taxonomy and latitudinal endpoints of taxa • Faunal lists • Taxonomy Endpoints of geographic ranges and ecologic data of taxa • Effective temperature • Present-day molluscan and paleomolluscan provinces Climatic regions • Continental climatic regions defined by temperature • Marine climatic regions defined by temperature • Effective temperature for fossil taxa • Percentage of fossil taxa with a particular effective temperature • PALEOSHORELINE MAPS AND PALEOCLIMATIC REGIONS • RESULTS • DISCUSSION • Role of temperature in limiting distribution of marine mollusks • Regional and global climatic changes • Late late Oligocene to late early Miocene time • Late early Miocene to early medial Miocene time • Late medial Miocene to early late Miocene time • Late Miocene to early Pliocene time • Early to late Pliocene time • Pleistocene time • Extralimital and extraprovincial or thermally anomalous molluscan taxa • Explanations for extraprovincial and thermally anomalous taxa • Sea-level oscillations • Regional extinction events • Survivorship of 1206 species, mostly molluscan taxa • Volcanism, climate, and extinctions Temperate marine paleoclimate • Species diversity • Increasing species diversity through time • Present-day latitudinal, molluscan diversity gradients Paleogeography • CONCLUSIONS • SUMMARY • ACKNOWLEDGMENTS • APPENDICES 


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