Petrographic data from the Lower Cretaceous Blackleaf Formation and Lower Upper Cretaceous Frontier Formation (lower part) in Beaverhead and Madison counties, Montana
By: by T.S. Dyman
Contributors: Geological Survey (U.S.)
Series: Open-file report -- 84-592; U.S. Geological Survey open-file report -- 85-592
Publisher: U.S. Dept. of the Interior, Geological Survey
Published: 1985
Place of publication: [Reston, Va.?]
Language: eng
Format: Microform
Subjects: Geology, Stratigraphic -- Cretaceous; Geology -- Montana
Notes: Distributed to depository libraries in microfiche

Bibliography: leaf 19

Microfiche. [Denver, Colo. : U.S. Geological Survey, 1985]. 1 microfiche ; 11 x 15 cm