Basin-wide correlation of the Perkasie Member. The inset map shows the location of the Perkasie Member of the Passaic Formation in the Newark basin and the locations of the stratigraphic sections. Abbreviations for grain size are: m, mud (clay and silt); s, sand; g, gravel; and c, cobble. Correlative units thicken from the northeastern lateral edge of the basin (sections 1 and 2) toward the center of the basin (section 3); from the southwestern end of the basin (sections 8 and 7) toward the center of the basin (section 5); and from the hinged margin of the basin (section 3) toward the border-fault system (section 5 and 6). The coarsest sediments are present in sections 5 and 6, which are located nearest to the border-fault system. Section 8, near the lateral edge of the basin, is coarser than section 7. Click on the image to view a larger version. Modified from Olsen et al. (1996).