Abstract

To better understand Laramide deformation, deep seismic reflection data have been depth migrated (focused or imaged) in order to more clearly reveal structural features associated with the Wind River thrust, Wyoming. Major structural features displayed in the migrated data are the Wind River fault zone and the Pacific Creek anticline. The Wind River fault zone is seen to a depth of at least 25 km and interpretively to 32 km. It is a complex zone that includes numerous splays flattening with depth. The Wind River Range was tilted along these arcuate splays as it was compressionally thrust up. The Pacific Creek anticline is asymmetric and thrust cored, with the top of basement offset 600 m. The Pacific Creek thrust is viewed as an embryonic Wind River thrust.

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