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The AAPG/Datapages Combined Publications Database

Wyoming Geological Association

Abstract


Symposium on Wyoming Tectonics and Their Economic Significance; 23rd Annual Field Conference Guidebook, 1971
Pages 61-64

Structural Geology of the Fanny Peak Lineament, Black Hills, Wyoming-South Dakota

Lewis H. Shapiro

Abstract

The mapping of Wulf (1955) and Brobst and Epstein (1963) at the intersection of the Fanny Peak and Black Hills monoclines has been extended northward along the trend of the former fold for a distance of about 40 miles. This completes mapping of the entire Fanny Peak Lineament within the Black Hills.

The Lineament was found to be comprised of a series of partially overlapping faults and monoclinal folds, interrupted near its northern end by three small igneous domes emplaced along its trend. These are clearly younger than the Lineament, thus probably placing the age of the Lineament in the Eocene. Some evidence is available to suggest that the uplift phase had ended by early Eocene, but further confirmation of this is needed.


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