Type sections and stratigraphy of the members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass arch, Montana /

Bibliographic Details
Main Author:	Cobban, William A., 1916-2015 (Author)
Format:	Government Document eBook
Language:	English
Published:	Washington : United States Department of the Interior, Geological Survey, 1976.
Series:	Geological Survey professional paper ; 974.
Subjects:	From 65 to 140 million years ago Geology, Stratigraphic > Nomenclature. Geology, Stratigraphic > Cretaceous. Geology > Montana. Geology > Montana > Blackleaf Formation. Cretaceous Geologic Period. Geology, Stratigraphic. Terminology.
Online Access:	https://purl.fdlp.gov/GPO/gpo89582

Description
Item Description:	Title from title screen (viewed October 6, 2014). "A report of a formal subdivision and age assignments of a classic Cretaceous area."
Physical Description:	1 online resource (iii, 66 pages) : illustrations, map.
Bibliography:	Includes bibliographical references (pages 61-63) and index.