Figure F9. Summary stratigraphic section for the Potomac (partim, ?Barremian-lower Albian) Formation in the Medford borehole. Potomac Unit II and Potomac Unit I sequences are defined in Sugarman et al. (2004). Pollen zonation of Brenner (1963, 1967) and Doyle and Robbins (1977). Red lines = sequence boundaries. TD = total depth. B = barren, ND = nondiagnostic.

Figure F9. Summary stratigraphic section for the Potomac (partim, ?Barremian-lower Albian) Formation in the Medford borehole. Potomac Unit II and Potomac Unit I sequences are defined in Sugarman et al. (2004). Pollen zonation of Brenner (1963, 1967) and Doyle and Robbins (1977). Red lines = sequence boundaries. TD = total depth. B = barren, ND = nondiagnostic.