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Stratigraphy of Mid-Cretaceous Blackleaf and lower part of the Frontier formations in parts of Beaverhead and Madison counties, Montana

Book ·
OSTI ID:5857067
;

The Albian Blackleaf Formation and the overlying Cenomanian to Turonian lower part of the Frontier formation in Beaverhead and Madison counties, Montana, were deposited within or east of the southwestern Montana fold-and-thrust belt. The Blackleaf Formation is subdivided into four mappable lithofacies units. The Albian age for this formation was determined from fossil bivalves and palynomorphs. The lower part of the Frontier Formation is composed of lithic sandstone, conglomerate, and subordinate mudstone and shale.

OSTI ID:
5857067
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
CONGLOMERATES
CORRELATIONS
FEDERAL REGION VIII
FOSSILS
GEOLOGIC FAULTS
GEOLOGIC FORMATIONS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
MONTANA
NATIONAL ORGANIZATIONS
NORTH AMERICA
RESEARCH PROGRAMS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SHALES
STRATIGRAPHY
US DOI
US ORGANIZATIONS
USA