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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
1Manuscript received August 20, 1998; revised manuscript received June 21,
1999; final acceptance September 3, 1999.
2Department of Geosciences, Franklin and Marshall College, Lancaster, PA
17604-3003; e-mail: D_WISE@ACAD.FANDM.EDU
ABSTRACT
block
of
Laramide mountain-front structures. New roadcuts and a deep well through basement refine
geometry of range overthrusting and show that these apparent tear faults are really
pivoting normal faults that cut frontal thrust structures on either side of an uplifted
corner flap. A ship's prow analogy of late-stage horizontal thrust motion is proposed with
the "bow wave" causing uplift and rotation of the corner flap. Volumetric
adjustments associated with late-stage stuffing of basin material beneath frontal thrusts
plus deeper duplexing of basement beneath the uplift helped define final details of range
geometry, a mechanism probably applicable elsewhere in the middle Rocky Mountains.
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