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The AAPG/Datapages Combined Publications Database

Montana Geological Society

Abstract

MTGS-AAPG

Montana Geological Society and Yellowstone Bighorn Research Association Joint Field Conference and Symposium: Geology of the Beartooth Uplift and Adjacent Basins
---, 1986

Pages 165 - 168

WHITE MOUNTAIN, NORTHWESTERN WYOMING A PSEUDO-VOLCANIC NECK

Willis H. Nelson, U.S. Geological Survey retired, 2692 Louis Road, Palo Alto, California 94303

ABSTRACT

At White Mountain a Heart Mountain detachment fault block is composed of metamorphosed sedimentary rocks capped by a spire of volcaniclastic rocks. This fault block is unique because it is composed of the only metamorphic rocks that are involved in Heart Mountain faulting. The metamorphism of the rocks at White Mountain does not extend below the Heart Mountain fault plane. Prior to 1965 the metamorphic discontinuity at the base of the fault block at White Mountain had not been recognized, and the spire was believed to be a volcanic neck that had metamorphosed the surrounding rocks.

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