Abstract
The Second Wall Creek sand in the Powder River basin in Johnson and Natrona Counties is similar in clast lithology, primary sedimentary structures, and facies association to the Torchlight Sandstone at the top of the Frontier Formation in the northern Big Horn basin. The Second Wall Creek sand is predominantly composed of medium to coarse-grained, moderately sorted massive to cross-bedded quartz-lithic wacke with a minor amount of carbonaceous shale and siltstone. The observed field relationships and petrographic data have important tectonostratigraphic implications concerning Late Cretaceous sedimentation in the Western Interior. In addition to its great potential as an oil-bearing horizon in both Big Horn and Powder River basins, this sediment-dispersal pattern will aid in reevaluating the regional sandbody architecture and reservoir characteristics of the upper Frontier Formation.
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