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Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1976

Norman Frederick SohlWilna B. WrightGeological Survey (U.S.)

出版	Department of the Interior, Geological Survey, 1977
URL	http://books.google.com.hk/books?id=yhSYM2pPHBkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Description of three largely volcaniclastic units, which are assigned early Cretaceous age.