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GEOREF RECORD

Structural pattern of eastern part of Disturbed Belt of Montana

M. R. Mudge
Structural pattern of eastern part of Disturbed Belt of Montana
AAPG Bulletin (May 1979) 63 (5): 836

Abstract

The eastern part of the disturbed belt of Montana is in the foothills east of the northern Rocky Mountains. The area studied extends about 190 km from Wolf Creek north to Browning, Montana. It is about 30 km wide in the northern and southern parts, narrowing to about 10 km in the central part. The eastern margin is bounded by a thrust fault or folds. The eastern part of the disturbed belt contains four structural-stratigraphic subdivisions which are, from west to east: (1) thrust-faulted Jurassic and Lower Cretaceous mudstone and sandstone; (2) folded and locally thrust-faulted Upper Cretaceous mudstone; (3) Upper Cretaceous sandstone and mudstone that are imbricately thrust faulted in the northern part, complexly folded near the central part, and folded and thrust faulted in the southern part; and (4) folded and locally thrust-faulted Upper Cretaceous thin sandstone and thick mudstone. The latter is absent in the central parts. Structural trends change from northwest in the northern part of the area, to due south in the central part, and southeast in the southern part.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AAPGBS
Serial Title: AAPG Bulletin
Serial Volume: 63
Serial Issue: 5
Title: Structural pattern of eastern part of Disturbed Belt of Montana
Author(s): Mudge, M. R.
Affiliation: U. S. Geol. Surv., Denver, Colo., United States
Pages: 836
Published: 197905
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: AAPG-SEPM-EMD Rocky Mountain sections, 28th annual meeting
Meeting location: Casper, Wyo., USA, United States
Meeting date: 19790603June 3-6, 1979
Summary: Y
Accession Number: 1979-033202
Categories: Structural geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
N47°00'00" - N48°40'00", W113°10'00" - W112°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1979
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