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The youngest Guadalupian shelf deposits in the Permian Basin region of West Texas and southeastern New Mexico are exposed in the Tansill Formation in East Dark Canyon, Guadalupe Mountains, New Mexico (Figs. 1 and 2). Previous investigations of the Capitan Limestone have suggested that Ochoan deposition was foreshadowed by Delaware Basin shallowing conditions (Babcock, 1974; Toomey and Babcock, 1983) and increasing restriction of basinal and shelf waters (Given and Lohmann, 1985) at the end of the Guadalupian. The deposits of the middle and uppermost Tansill Formation (Tyrrell et al., 1978) in East Dark Canyon provided the opportunity to describe and interpret the latest pulses of Guadalupian back-reef sedimentation in the barrier-island complex of the shelf.

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