Abstract
ABSTRACT Detailed correlation of sections of Pennsylvanian and Permian sequences in the central Front Ranges reveals spectacular lateral facies changes, thickness variations, discontinuities, diamstems, and paraconformities, as well as disconformities with silcrete surfaces, basal conglomerates, regolith-like novaculitic cherts, bioturbated surfaces and local erosional relief up to 5 ft (1.6 m). Such disconformities can represent regional, very low angle truncations as evidenced by the profound unconformity developed within the Permian below the Ranger Canyon Formation (Guadalupian). A thrust fault displaying a localized lateral ramp occurs in the northern Elk Mountains, and the Permian and Pennsylvanian successions change facies across the fault.
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