The Chicora Member is here named the upper member of the Williamsburg Formation of the Black Mingo Group in the SC Coastal Plain. The here revised Black Mingo Group includes all the strata from the base of the Paleocene to the top of the Ypresian Stage of the Eocene and is divided into the Danian Rhems Formation, the Thanetian Williamsburg Formation and unnamed Ypresian strata. [In the Clubhouse Crossroads corehole No. 1, Gohn and others (1978) assigned the entire Paleocene section to the Black Mingo Formation, and Gohn and others (1983) named the Ypresian strata the Fishburne Formation.] The Chicora Member consists of glauconitic, argillaceous, fossiliferous sand and indurated molluscan-rich limestone. Gradationally overlies the Lower Bridge Member of the Williamsburg; unconformably underlies unnamed Ypresian strata of the Black Mingo Group. Thickness at type section is 8 ft. Age is late Paleocene (Thanetian).

Source: GNU records (USGS DDS-6; Reston GNULEX).