A 300 ft subsurface conventional core through Upper Pennsylvanian shelf-margin carbonate bank of the Eastern Shelf of the Permian Basin (Sun #1 Criswell well, Ocho Juan Field, Fisher County, Texas), was analyzed for fusulinid biostratigraphic agedating. The cored interval from the Ocho Juan shelf-margin carbonate bank consists of two thick shallowing-upward depositional sequences that were age-dated as late middle and late Missourian and therefore are assignable to the Canyon Group. The upper sequence (Sequence 2) had two fusulinid-bearing intervals, which contained Triticites primarius Merchant and Keroher, T. newelli Burma, T. iatensis Thompson, and T. kawaensis Thompson, and was dated as late Missourian in age (Mf4 Zone ofWahlman, 2019). The underlying sequence (Sequence 1) contained only small juvenile fusulinids and fusulinid fragments in a thin packstone-grainstone interval, and those small specimens were tentatively identified as Triticites aff. T. heroyi Bilelo, Triticites aff. T. ferayi Bilelo, and Kansanella sp., and were interpreted as most likely being late middle Missourian in age (Zone Mf3 ofWahlman, 2019). These are the first fusulinid species identified and illustrated from the strata of the shelf-margin carbonate bank system of the Eastern Shelf of the Permian Basin.
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