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.; Open-file report (Geological Survey (U.S.)) -- 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.