The Diatom Genus Actinocyclus in the Western United States
A, Aciinocyclm Species from Lacustrine Miocene Deposits pf the Western United States
B, Geologic Ranges of Lacustrine Species, Western SnltS States
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J. Platt Bradbury and William N. Krebs, Editors
A. Actinocyclus (Bacillariophyta) Species from Lacustrine Miocene Deposits of the Western United States By J. Platt Bradbury and William N. Krebs
B. Geologic Ranges of Lacustrine Actinocyclus Species, Western United States By William N. Krebs and J. Platt Bradbury
U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1543A-B
UNITED STATES GOVERNMENT PRINTING OFFICE : 1995 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary
U.S. GEOLOGICAL SURVEY Robert M. Hirsch, Acting Director
For sale by U.S. Geological Survey, Map Distribution Box 25286, MS 306, Federal Center Denver, CO 80225
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Library of Congress Cataloging-in-Publication Data
The Diatom genus Actinocyclus in the Western United States / J. Platt Bradbury and William N. Krebs, editors. p. cm.—(U.S. Geological Survey professional paper ; 1543) Includes bibliographical references Contents: A. Actinocyclus (Bacillariophyta) species from lacustrine Miocene deposits of the Western United States / by J. Platt Bradbury and William N. Krebs— B. Geologic ranges of lacustrine Actinocyclus species, Western United States / by William N. Krebs and J. Platt Bradbury. Supt. of Docs, no.: I19.16:P1543A&B. 1. Actinocyclus, Fossil—West (U.S.) 2. Paleobotany—Miocene. II. Krebs, William N. III. Series. QE955.D53 1993 561'.93—dc20 93-35637 CIP CONTENTS
[Letters designate the chapters]
(A) Actinocyclus (Bacillariophyta) species from lacustrine Miocene deposits of the West ern United States, by J. Platt Bradbury and William N. Krebs (B) Geologic ranges of lacustrine Actinocyclus species, Western United States, by William N. Krebs and J. Platt Bradbury Actinocyclus (Bacillariophyta) Species from Lacustrine Miocene Deposits of the Western United States
By J. Platt Bradbury and William N. Krebs
THE DIATOM GENUS ACTINOCYCLUS IN THE WESTERN UNITED STATES
U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1543-A
UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1995 CONTENTS Abstract...... 1 Introduction...... 1 Acknowledgments...... 1 Materials and methods ...... 2 Choice of generic epithet...... 2 Key for separation of some nonmarine species of Actinocyclus...... 3 Systematic descriptions...... 4 Paleoecology of Miocene lacustrine Actinocyclus...... 13 References...... 14 Index...... 68