Figure F7. Summary stratigraphic section for the Potomac (partim, lower Cenomanian) Formation in the Medford borehole. Potomac Unit III sequence is defined in Sugarman et al. (2004). Pollen zonation of Brenner (1963, 1967) and Doyle and Robbins (1977). Red lines = sequence boundaries. B = barren, ND = nondiagnostic.

Figure F7. Summary stratigraphic section for the Potomac (partim, lower Cenomanian) Formation in the Medford borehole. Potomac Unit III sequence is defined in Sugarman et al. (2004). Pollen zonation of Brenner (1963, 1967) and Doyle and Robbins (1977). Red lines = sequence boundaries. B = barren, ND = nondiagnostic.