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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 60 (1976)

Issue: 12. (December)

First Page: 2142

Last Page: 2149

Title: Exposed Step in Laramide Thrust Fault, Southwest Montana: GEOLOGIC NOTES

Author(s): D. S. Brumbaugh (2), H. W. Dresser (3)

Abstract:

The Sandy Hollow thrust fault of southwestern Montana is a Laramide overthrust that possesses an unusually well-exposed step. In the step zone folding, fault-transported slices, splinter faults, and decollement have resulted from fault movement. The wide variety of both brittle and ductile structures commonly should be associated with steps because they are the inevitable result of step-fault mechanics in the restricted temperature/pressure environment in which thrusts form. Field evidence clearly indicates that preexisting folds controlled the development of this step zone in the Sandy Hollow thrust.

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