Boerne-Sisterdale Locality (GA Bishop Coll. 25)

The presence of mud cracks, bored bedding planes, bedding planes with encrusting oysters, algal mat laminations, ripple marks, dinosaur trailways, and plant debris is evidence for supratidal, intertidal. or shallow subtidal conditions. Beds of lime muds containing echinoids, miliolid foraminifera, infaunal pelecypods, corals and numerous gastropods imply marine conditions prevailed at times. The interbedding of these sediments points to a depositional system of shallow marine lagoons with numerous small islands or rapidly prograding supratidal areas in protected lagoons behind a reef-like barrier (Winter 1962, Hendricks and Wilson 1967:5, Stricklin et al.1971, Young 1972:1).

Boerne-Sisterdale Locality {GAB 25). —This exposure is a road cut on Texas Farm\r\nRoad 1376 at the top of a hill (Fig. 5) 12 km (7.5 mi) north of Boerne, Kendall Co.,\r\nTexas. Approximately 9 m (30 ft) of Glen Rose Limestone is exposed in the road cut\r\n(Fig. 6). The road cut is about 37 m (120 ft) above exposures of the Corbula bed at\r\nthe Hodges Range Section (GAB 26) 1.6 km (1 mi) to the northwest, and probablynear the top of the fourth open shelf unit of Young (1974:177). Numerous remains of\r\ndecapods were collected from a biomicrite near the bottom of the road cut (at arrow\r\nin Fig. 6).\r\nDecapod remains occur throughout an interval 3 m (10 ft) in thickness but are\r\nmost abundant in a 46 cm (\r\n\r\n1 8 in) bed of fossiliferous biomicrite. The specimens weather\r\nout of the platey marl and accumulate on the ledge formed by the underlying resistant\r\nbed.\r\nThe entire fauna has not been investigated in detail but numerous specimens of\r\nHomomya are present and preserved in living position. Other elements of the fauna\r\ninclude numerous pelecypods, gastropods, and masses of serpulid worm tubes.