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The AAPG/Datapages Combined Publications Database

Earth Science Bulletin (WGA)


Earth Science Bulletin
Vol. 15 (1982), No. 1. (Annual), Pages 142b-143

Abstract: Structural Geology of Teton Pass, Wyoming

Sandra Dunn1

Wyoming Geological Association: 1982 Luncheon Meetings Casper, Wyoming: Abstracts of Papers

Detailed geology mapping along Teton Pass, southwest of Jackson Hole, Wyoming, has led to a reinterpretation of the spatial and sequential relations between the early Tertiary Sevier-type Jackson Thrust and the Laramide-type Cache Creek Upthrust. Where the two faults overlap, structural evidence from both plates shows that thrust-belt formations on the Jackson Plate were overridden by foreland units during westward movement of the Cache Creek Upthrust.

Small splays in the Jackson Plate were shoved up, by movement of the Cache Creek Upthrust, to form the north limb of a steep syncline. This movement overturned an anticline, along the leading edge of the Jackson Plate, towards the southwest. Continued movement by the Cache Creek Plate overturned another anticline, on the leading edge of the Cache Creek Plate. Deformation, after overturning, was severe enough to break this anticline along two major faults. These high-angle reverse faults die out westward into the overturned anticline.

Shales and sandstones, tentatively identified as the Cretaceous Frontier Formation, and belonging to the common lower plate of both the Jackson Plate and the Cache Creek Plate, have been squeezed up between the Jackson Fault and the Cache Creek Fault. Exposure of these units is more extensive westward along the pass as the Jackson Plate and the Cache Creek Plate separate.

This study confirms that along Teton Pass, Laramide-type deformation truncates Sevier-type structures.

Acknowledgments and Associated Footnotes

1 Sandra Dunn: Gulf Oil

© Wyoming Geological Association, 2015