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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. INTRODUCTION The northern Atlantic Coastal Plain was one of the earliest areas investigated geologically in North America, and a stratigraphy of Coastal Plain formations gradually evolved from the many early investigations. Much effort was devoted to the study of the sediments of Cretaceous to early Tertiary age because of their good exposure between Raritan Bay, N.J., and the Potomac River in northern Virginia. North and south of this region, younger sediments overlap and obscure the underlying Cretaceous and lower Tertiary beds. In the northern Atlantic Coastal Plain the most detailed stratigraphy of these beds was established for the west-central and northern parts of the Coastal Plain in New Jersey. In Delaware and Maryland, the stratigraphy that evolved was less detailed. One of the major reasons for the lack of knowledge of detailed stratigraphy southwest of New Jersey is that Delaware Bay and Chesapeake Bay prevent tracing along the outcrop of the New Jersey formations into Delaware and Maryland. These bays divide the outcrop belt of Upper Cretaceous and lower Tertiary formation^, in the northern Atlantic Coastal Plain into three arts: New Jersey, Delmarva Peninsula (east of Chesapeake Bay), and the western Maryland Coastal Plain (west of Chesapeake Bay). In recent years, three major attempts have been made to extend the Upper Cretaceous-lower Tertiary stratigraphy of New Jersey into the Delmarva Peninsula, the flat low-lying area between the Delaware and Chesapeake Bays (fig. 1). Since 1957 the U.S. Geological Survey has been mapping the rock Stratigraphic units of the Coastal Plain in New Jersey. An area of about 600 square miles has been mapped at a scale of 1:24,000 in west-central New Jersey near Trenton and in the adjacent parts of Pennsylvania. Mapping also has been completed in the Sandy Hook quadrangle to the northeast and in the Woodstown quadrangle to the southwest (fig. 1), both in New Jersey. Reconnaissance has been done in the areas between. In addition, mapping and reconnaissance recently has be^n extended into the Delmarva Peninsula. This report is divided into two parts: (1) rock Stratigraphic studies and (2) biostratigraphic analysis. The region discussed extends from Sandy Hook, N.J., to Chesapeake Bay, Md. (fig. 1). The main emphasis is on the Stratigraphic relationships tetween units of southern New Jersey and the northern Delmarva Peninsula. PREVIOUS INVESTIGATIONS Numerous lithostratigraphic and biostratigraphic studies have been made of Cretaceous-Tertiary rocks in the northern part of the Atlantic Coastal Plain during the past century. Only those that are particularly significant to the main topic of this paper will STRATIGRAPHY OF OUTCROPPING POST-MAGOTHY UPPER CRETACEOUS FORMATIONS 1. Trenton West (unpublished data) 2. Trenton East, GQ-341 3. Allentown, GQ-566 4. Roosevelt, GQ-340 5. Bristol, GQ-342 6. Columbus, GQ-160 7. New Egypt, GQ-161 8. Mount Holly, GQ-272 9. Pemberton, GQ-262 10. Browns Mills, GQ-264 11. Woodstown, GQ-404 12. Sandy Hook, Bull. 1276 Approximate inner edge of Coastal Plain Province-^ Atlantic Highlands PENNSYLVANIA MARYLAND

Stratigraphy of the outcropping post-Magothy Upper Cretaceous formations in southern New Jersey and northern Delmarva Peninsula, Delaware and Maryland