Each member of the Wilberns Formation boasts a different diagenetic history, due to this staggering complexity of the individual members that compose the Wilberns Formation; each member’s geologic history will be explored. The one common feature of the members of the Wilberns is that they were deposited from the middle Cambrian to the late Cambrian; however, depositional environments were varied throughout the depositional history of the Wilberns formation (Barnes and Bell, 1977). The Paleogeographic map of North America (fig. 5) from Blakely (2005) demonstrates that the Llano region of central Texas was submerged in a shallow sea, this map is an approximation, especially given that aeolian sedimentary phenomena, like calcrete (Read, in Walter, 1976, p. 56; Deso, 1998, p. 49), and desiccation cracks (Gann, 2000, p. 53) are foundsporadically at outcrop. These aeolian features are more than likely features of a subaerially exposed shoal or tidal flat during short-lived, local eustatic periods. The controlling factor during the deposition of the Wilberns formation, and for all of Texas and North America during the middle to late Cambrian is the Sauk Sequence
Each member of the Wilberns Formation boasts a different diagenetic history, due to this staggering complexity of the individual members that compose the Wilberns Formation; each member’s geologic history will be explored. The one common feature of the members of the Wilberns is that they were deposited from the middle Cambrian to the late Cambrian; however, depositional environments were varied throughout the depositional history of the Wilberns formation (Barnes and Bell, 1977). The Paleogeographic map of North America (fig. 5) from Blakely (2005) demonstrates that the Llano region of central Texas was submerged in a shallow sea, this map is an approximation, especially given that aeolian sedimentary phenomena, like calcrete (Read, in Walter, 1976, p. 56; Deso, 1998, p. 49), and desiccation cracks (Gann, 2000, p. 53) are foundsporadically at outcrop. These aeolian features are more than likely features of a subaerially exposed shoal or tidal flat during short-lived, local eustatic periods. The controlling factor during the deposition of the Wilberns formation, and for all of Texas and North America during the middle to late Cambrian is the Sauk Sequence