This is a map of the crystalline bedrock units in the Piedmont of Delaware and adjacent Pennsylvania. The southern boundary of the mapped area is the updip limit of the Potomac Formation (Woodruff and Thompson, 1972, 1975). Soil, regolith, and surficial deposits of Quaternary age are not shown.
Please give proper credit to the Delaware Geological Survey.
Delaware Geological Survey
Phone: (302)-831-2833
Fax: (302)-831-3579
delgeosurvey@udel.edu
University of Delaware
Delaware Geological Survey Building
Newark, DE 19716
Mon - Fri; 8:00am to 4:30pm
Map Scale 1:36,000.
Centroid: 39.73, -75.60
- Appalachian Piedmont
- arc affinity
- Arden Granite
- Ardentown Granitic Suite
- Baltimore Gneiss
- Barley Mill Gneiss
- bedrock
- Brandywine Blue Gneiss
- Bringhurst Gabbro
- Christianstead Gneiss
- Cockeysville Marble
- Cretaceous Period
- cross-sections
- Faulkland Gneiss
- Iron Hill Gabbro
- mapping
- Metapyroxenite and metagabbro (undifferentiated)
- Mill Creek Metagabbro
- New Castle County
- Newark
- Pegmatite
- Pennsylvanian Period
- Permian Period
- Rockford Park Gneiss
- rocks
- Serpentinite
- Setters Formation
- Upper Cretaceous
- wetlands
- Wilmington
- Wilmington Complex
- Windy Hills Gneiss
- Wissahickon Formation
- Carboniferous Period
- Jurassic Period
- Lower Cretaceous
- Mississippian Period
- Devonian Period
- Triassic Period
- Silurian Period
- Ordovician Period
- Cambrian Period
- Mesozoic Era
- Paleozoic Era
- Precambrian



First State Geology has been the newsletter of DGS for over 25 years.



