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Late Jurassic Ammonites from the Western Sierra Nevada, California

Ralph Willard Imlay

出版	U.S. Government Printing Office, 1961
URL	http://books.google.com.hk/books?id=f3j79EEpD9EC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Ammonites furnish correlations with Jurassic rocks elsewhere on the Pacific coast and with the standard European stages.