The Hartville uplift of eastern Wyoming is a structural arch connecting the Black Hills uplift with the Laramie Range. It displays several periods of tectonic activity--Late

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Pennsylvanian, post-Wolfcamp-pre-Leonard, post-Triassic-pre-Late Jurassic, pre-Cretaceous, and post-Paleocene.

Early structural exploration along the southeast Powder River basin rim resulted in several oil and gas discoveries, notably Lance Creek field with pay zones of Cretaceous, Jurassic, Permian, and Pennsylvanian ages. Recent exploration has resulted in stratigraphic discoveries in Cretaceous and Pennsylvanian rocks. This rather sparsely drilled area appears to have excellent potential for additional stratigraphic traps in Cretaceous and Pennsylvanian sandstones.

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