Stratigraphic studies of the post-Magothy Upper Cretaceous Coastal Plain formations of the Delmarva Peninsula indicate that four of the formations recognized in New Jersey are present in northern Delaware and eastern Maryland. These are the Merchantville, Englishtown, and Marshalltown Formations and the Mount Laurel Sand; the Wenonah and Navesink Formations probably either pinch out or have been eroded away between southern New Jersey and northern Delaware. Although the four formations persist as recognizable lithostratigraphic units from New Jersey into the Delmarva Peninsula, each shows a depletion of glauconite sand toward the southwest. Comparison of the faunas of the formations in the two areas confirms the rock Stratigraphic correlations. The megainvertebrate fossils have proved to be, in this area, more useful than the microfauna in Stratigraphic correlation. The Exogyra cancellata zone in the Mount Laurel Sand and the E. ponderosa zone in the Marshalltown Formation are in the same Stratigraphic positions in southern New Jersey and in the Delmarva Peninsula.
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