Oligocene Molluscan Biostratigraphy and Paleontology of the Lower Part of the Type Temblor Formation, California
Oligocene Molluscan Biostratigraphy and Paleontology of the Lower Part of the Type Temblor Formation, California
GEOLOGICAL SURVEY PROFESSIONAL PAPER 791 Oligocene Molluscan Biostratigraphy and Paleontology of the Lower Part of the Type Temblor Formation, California
By WARREN O. ADDICOTT
GEOLOGICAL SURVEY PROFESSIONAL PAPER 791
Marine mollusks from the basal shale (Cymric Shale Member) and the overlying sandstone (Wygal Sandstone Member) are of provincial Oligocene age. Warm-water assemblages from the Wygal Sandstone Member represent a previously unrecognized biostratigraphic unit of late Oligocene age in California
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1973 UNITED STATES DEPARTMENT OF THE INTERIOR
ROGERS C. B. MORTON, Secretary
GEOLOGICAL SURVEY
V. E. McKelvey, Director
Library of Congress catalog-card No. 72-600377
For sale by the Superintendent of Documents, U.S. Government Printing OfBce, Washington, D.C. 20402 Price: paper cover-$1.25, domestic postpaid; $1.00, GPO Bookstore Stock No. 2401-00284 CONTENTS
Page Page Abstract ______1 Systematic descriptions Continued Introduction ______1 Class Pelecypoda ______22 Acknowledgments ______3 Order Nuculoida ______22 Reports dealing with mollusks from the lower part Family Nuculidae ____ 22 of the Temblor Formation ______3 Family Nuculanidae __ 22 Stratigraphy ______4 Order Arcoida ______23 Wygal Sandstone Member ______4 Family Arcidae ______23 Provincial age and correlation ______6 Order Mytiloida ______24 General considerations ______6 Family Mytilidae 24 Cymric Shale Member ______8 Order Pterioida ______24 Wygal Sandstone Member ______10 Family Pectinidae 24 Santos Shale Member ______13 Family Ostreidae ____ 27 Agua Sandstone Member ______14 Order Veneroida ______27 Paleobathymetry ______14 Family Lucinidae __ 27 Zoogeography and paleoclimatology ______15 Family Ungulinidae _ 29 Systematic descriptions ______16 Family Mactridae 29 Class Gastropoda ______17 Family Solenidae ____ 30 Order Archaeogastropoda ______17 Family Tellinidae ____ 30 Family Trochidae ______17 Family Veneridae ____ 35 Order Mesogastropoda ______17 Order Myoida ______37 Family Cerithiidae? ______17 Family Myidae ______37 Family Calyptraeidae __-______17 Class Scaphopoda ______38 Family Naticidae ______18 Family Dentaliidae 38 Family Ficidae ______20 Fossil localities ______38 Order Neogastropoda ______20 References ______40 Family Neptuneidae ______20 Index ______45
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