The Woodbine Formation is a body of Late Cretaceous fossiliferous rock extending through north central Texas. Famed Texas geologist RT Hill, who first mapped its exposures during his geological survey from Big Bend to North Texas, named the formation for the town of Woodbine in Cooke County (Hill, 1901). It represents the oldest Upper Cretaceous unit in the Gulf Coastal Plain (Hedlund, 1966; Oliver, 1971). The Woodbine is exposed along a line extending between Temple in central Texas northward to Lake Texoma in southern Oklahoma, cropping out as a narrow and irregular band from Johnson to Cooke counties (Figure 1)(Dodge, 1969; Johnson, 1974; Oliver, 1971; Trudel, 1994). Exposures are up to 32 km wide at the surface and 100 meters deep, thinning to the south and east (Dodge, 1969; Johnson, 1974). The formation unconformably overlies the Grayson Marl of the Washita Group and is unconformably overlain by the Eagle Ford Group (Johnson, 1974; Oliver, 1971). There is a period of marine deposition over a duration of at least ten million years separating the Woodbine Formation from the earlier terrestrial depositional systems characterizing the Lower Cretaceous Trinity Group (Winkler et al., 1995). During the Cretaceous, Woodbine sediments originated from the Ouachita Mountains in southern Oklahoma and were deposited in a series of near shore environments within the subsiding East Texas Basin (Figure 2)(Dodge, 1952; Oliver, 1971). Woodbine deposits represent primarily terrigenous near shore and shallow marine depositional systems, including shelf, deltaic, and fluvial environments (Main, 2005, 2013; Oliver, 1971; Trudel, 1994).