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The “Wolfcamp Shale” of the Permian Basin in west Texas is a prime source of oil reserves within the USA. Despite its growing importance, definitive ages and stratigraphic correlations across the basin remain unclear. Fusulinid studies have assigned an approximate age of Late Pennsylvanian (Missourian) to early Permian (Leonardian) for the “Wolfcamp Shale,” but exact horizons for regional stage boundaries are not well defined. Analysis of conodont specimens from three cored basinal shale intervals of the Shell Stevens L1V well in the northern part of the Midland Basin (Lynn County, Texas) improves interpretation of regional stage boundaries within the...

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