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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

Volume: 34 (1950)

Issue: 7. (July)

First Page: 1552

Last Page: 1564

Title: Deformation of Fort Union Formation Near Lignite, North Dakota

Author(s): R. C. Townsend (2)

Abstract:

The Fort Union formation is intensely folded and faulted in an area southwest of the town of Lignite, northwestern North Dakota, as shown in exposures in a topographic bench along the northeast or proximal slope of the Altamont(?) moraine. The deformation is believed to be the result of deep-seated forces. The trend of the folds and faults is parallel with the trend of the Altamont(?) moraine. Available evidence indicates the bedrock to be higher under the Altamont(?) moraine than under the adjacent ground-moraine plain. It is suggested that the structures described may be genetically related to the bedrock high on which the Altamont(?) moraine is deposited, and that the Fort Union formation may be folded and faulted over a wider area than is now known. Also, structures i the Fort Union formation may reflect deformation of older rocks at depth.

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