The southernmost of three intermontane basins was reevaluated in the late 1970s by Amoco. Geophysical data indicated a deeper and more structurally complex basin than expected. Reinecker Ridge is a large anticlinorial structure in the center of the basin, which was unsuccessfully drilled in 1978. The well deviated away from the structure and the Dakota Sandstone objective. Vitrinite reflectance data indicate the structure is unlikely to be oil productive because it was formed after oil generation; therefore this portion of the basin has low exploration potential.

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