This report accompanies a new map that revises the original bedrock geologic maps of the Delaware Piedmont compiled by Woodruff and Thompson and published by the Delaware Geological Survey (DGS) in 1972 and 1975. Combined detailed mapping, petrography, geochemistry, and U-Pb geochronology have allowed us to redefine two rock units and formally recognize eleven new units. A section of the Pennsylvania Piedmont is included on the new map to show the entire extent of the Mill Creek Nappe and the Arden Plutonic Supersuite.
Please give proper credit to the Delaware Geological Survey.
Plank, M.O., Schenck, W.S., Srogi, L., 2000, Bedrock Geology of the Piedmont of Delaware and Adjacent Pennsylvania: Delaware Geological Survey Report of In