At the base of the Ken-Bf 180 core, from a depth of 480 ft to 476.3 ft is mottled, silty clay and lignitic wood containing a palynomorph assemblage that is considered to be late Albian (Zone IIC). This zone and Zone III (lower Cenomanian) have been assigned to the Early Cretaceous Elk Neck beds of the Patapsco Formation. The interval logged between 422.3 ft and 476.3 ft is composed of two pebbly sands of fluvial origin separated by a 4.2-ft micaceous, light-gray or yellowish-gray, silty clay. This interval is assigned to the Late Cretaceous Elk Neck Beds of the Patapsco Formation(?) and/or Raritan Formation for it contains specimens which are restricted to the middle Cenomanian Zone IV, usually assigned to the Raritan Formation. Lower Cenomanian Zone III (and the Elk Neck beds of this age) appear to be missing in this core. Overlying interval is assigned to the Late Cretaceous Magothy Formation.

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