GM6 Geology of the Dover Area, Delaware
- Atlantic Coastal Plain
- Calvert Formation
- cross-sections
- Dover
- Holocene
- Hornerstown Formation
- Kent County
- Magothy Formation
- mapping
- Matawan Formation
- Miocene
- Monmouth Formation
- Neogene
- Pamunkey Formation
- Piney Point Formation
- Pliocene
- Potomac Formation
- rocks
- subsurface
- upper Holocene
- upper Pleistocene
- upper Pliocene
- Vincentown Formation
- lower Holocene
- lower Pliocene
- middle Pleistocene
- Miocene
- Pleistocene
- Tertiary Period
- upper Miocene
- lower Pleistocene
- middle Miocene
- lower Miocene
GM5 Geology of the Smyrna-Clayton Area, Delaware
- Atlantic Coastal Plain
- Clayton
- cross-sections
- Holocene
- Hornerstown Formation
- mapping
- Miocene
- Monmouth Formation
- Nanjemoy Formation
- Neogene
- New Castle County
- Piney Point Formation
- Pliocene
- rocks
- sediments
- Smyrna
- subsurface
- upper Holocene
- upper Pleistocene
- upper Pliocene
- Vincentown Formation
- lower Holocene
- lower Pliocene
- middle Pleistocene
- Miocene
- Pleistocene
- Tertiary Period
- upper Miocene
- lower Pleistocene
- middle Miocene
- lower Miocene
GM4 Geology of the Wilmington Area, Delaware
- Appalachian Piedmont
- Arden Granite
- Bringhurst Gabbro
- Cretaceous Period
- cross-sections
- mapping
- New Castle County
- Pennsylvanian Period
- Permian Period
- rocks
- subsurface
- surficial geology
- Upper Cretaceous
- Wilmington
- Wilmington Complex
- 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
GM3 Geology of the Newark Area, Delaware
- Appalachian Piedmont
- Augite
- Baltimore Gneiss
- Cockeysville Marble
- Cretaceous Period
- cross-sections
- Faulkland Gneiss
- Glenarm Series
- Holocene
- Iron Hill Gabbro
- mapping
- Microcline
- Miocene
- Monazite
- Montmorillonite
- Neogene
- New Castle County
- Newark
- Oligocene
- Pegmatite
- Pennsylvanian Period
- Permian Period
- Pliocene
- rocks
- subsurface
- Upper Cretaceous
- upper Eocene
- upper Holocene
- upper Pleistocene
- upper Pliocene
- Wissahickon Formation
- Carboniferous Period
- Eocene
- Jurassic Period
- Lower Cretaceous
- lower Holocene
- lower Pliocene
- middle Eocene
- middle Pleistocene
- Miocene
- Mississippian Period
- Paleogene
- Pleistocene
- Tertiary Period
- upper Miocene
- Devonian Period
- lower Eocene
- lower Pleistocene
- middle Miocene
- Paleocene
- Triassic Period
- lower Miocene
- Silurian Period
- Ordovician Period
- Mesozoic Era
- Paleozoic Era
DGS Geologic Map No. 8 (Milford-Mispillion River Quadrangles) Dataset
The scanned raster and vector datasets contains the rock unit polygons for the surficial geology for DGS Geologic Map No. 8 (Milford-Mispillion River Quadrangles). This map is the first detailed surficial geologic map in southern Kent and northern Sussex counties.
- ArcGIS
- Atlantic Coastal Plain
- Calvert Formation
- Carolina Bay deposits
- Choptank Formation
- Columbia Formation
- cross-sections
- Kent County
- Lynch Heights Formation
- mapping
- marsh and tidal deposits
- Quantum GIS
- rocks
- Scotts Corners Formation
- shoreline deposits
- St. Marys Formation
- STATEMAP
- surficial geology
- wetlands
- WFS Feature Service
- WMS Map Service
- Shapefile
DGS Geologic Map No. 11 (Milton-Ellendale area) Dataset
These vector and raster data sets contain the rock unit polygons for the surficial geology in the Delaware Coastal Plain covered by DGS Geologic Map No. 11 (Milton-Ellendale area) in ESRI shapefile and TIF format.
- ArcGIS
- Atlantic Coastal Plain
- Beaverdam Formation
- Calvert Formation
- Carolina Bay deposits
- Choptank Formation
- cross-sections
- dune deposits
- Lynch Heights Formation
- Manokin aquifer
- marsh deposits
- Quantum GIS
- rocks
- Scotts Corners Formation
- shoreline deposits
- St. Marys Formation
- surficial geology
- Sussex County
- swamp deposits
- upland deposits
- wetlands
- WFS Feature Service
- WMS Map Service
- Shapefile
DGS Geologic Map No. 9 (Seaford area) Dataset
These raster and vector datasets contains the rock unit polygons for DGS Geologic Map No. 9 (Seaford). This map shows the distribution of geologic units found at or near land surface.
- ArcGIS
- Atlantic Coastal Plain
- Beaverdam Formation
- Choptank Formation
- cross-sections
- Manokin formation
- mapping
- marsh deposits
- Nanticoke deposits
- Quantum GIS
- rocks
- Seaford
- St. Marys Formation
- STATEMAP
- surficial geology
- Sussex County
- swamp deposits
- upland bog
- wetlands
- WFS Feature Service
- WMS Map Service
- Shapefile
DGS Geologic Map No. 10 (Bedrock Geologic Map of the Piedmont of Delaware and Adjacent Pennsylvania) Dataset
The vector and raster data sets contains the rock unit polygons for the surficial geology for DGS Geologic Map No. 10. This map is of the crystalline bedrock units in the Piedmont of Delaware and adjacent Pennsylvania.
- Appalachian Piedmont
- ArcGIS
- Arden Granite
- Ardentown Granitic Suite
- Baltimore Gneiss
- Barley Mill Gneiss
- bedrock
- Brandywine Blue Gneiss
- Bringhurst Gabbro
- Christianstead Gneiss
- Cockeysville Marble
- cross-sections
- Faulkland Gneiss
- Iron Hill Gabbro
- mapping
- Metapyroxenite and metagabbro (undifferentiated)
- Mill Creek Metagabbro
- New Castle County
- Pegmatite
- Pennsylvania
- Quantum GIS
- Rockford Park Gneiss
- rocks
- Serpentinite
- Setters Formation
- wetlands
- WFS Feature Service
- Wilmington Complex
- Windy Hills Gneiss
- Wissahickon Formation
- WMS Map Service
- Shapefile
DGS Geologic Map No. 14 (Kent County) Dataset
This data set contains the rock unit polygons for the surficial geology in ESRI shapefile format for DGS Geologic Map No. 14 (Geologic Map of Kent County, Delaware). This map shows the surficial geology of Kent County, Delaware, at a scale of 1:100,000.
- alluvium and swamp deposits
- Appalachian Piedmont
- ArcGIS
- Atlantic Coastal Plain
- Beaverdam Formation
- Calvert Formation
- Carolina Bay deposits
- Choptank Formation
- Clayton
- Columbia Formation
- cross-sections
- Dover
- fill
- Kent County
- Lynch Heights Formation
- mapping
- marsh deposits
- Piney Point Formation
- Quantum GIS
- rocks
- Scotts Corners Formation
- shoreline deposits
- Smyrna
- St. Marys Formation
- surficial geology
- swamp deposits
- Turtle Branch Formation
- undrained depression deposits
- WFS Feature Service
- WMS Map Service
- Shapefile
DGS Geologic Map No. 12 (Lewes-Cape Henlopen area) Dataset
These vector and raster data sets contain the rock unit polygons for the surficial geology in ESRI shapefile and TIF format for the Delaware Coastal Plain covered by DGS Geologic Map No. 12 (Lewes-Cape Henlopen area).
- ArcGIS
- Beaverdam Formation
- Bethany Formation
- Calvert Formation
- Cape Henlopen
- Choptank Formation
- cross-sections
- dune deposits
- Lewes
- Lynch Heights Formation
- Manokin formation
- mapping
- marine deposits
- marsh deposits
- Quantum GIS
- rocks
- Scotts Corners Formation
- shoreline deposits
- spit deposits
- St. Marys Formation
- STATEMAP
- surficial geology
- Sussex County
- swamp deposits
- wetlands
- WFS Feature Service
- WMS Map Service
- Shapefile
DGS Geologic Map No. 13 (New Castle County) Dataset
This dataset contains the geologic polygons used for the creation of DGS Geologic Map 13. This dataset shows the surficial geology of New Castle County, Delaware, at a scale of 1:100,000.
- Appalachian Piedmont
- ArcGIS
- Ardentown Granitic Suite
- Atlantic Coastal Plain
- Baltimore Gneiss
- Barley Mill Gneiss
- Brandywine Blue Gneiss
- Bridgeton Formation
- Bringhurst Gabbro
- Bryn Mawr Formation
- Calvert Formation
- Chesapeake and Delaware Canal
- Christianstead Gneiss
- Cockeysville Marble
- Columbia Formation
- cross-sections
- Delaware Bay Group
- dredge disposal deposits
- Englishtown Formation
- Faulkland Gneiss
- fill
- Hornerstown Formation
- Iron Hill Gabbro
- Lynch Heights Formation
- Magothy Formation
- Manasquan Formation
- Marcus Hook
- marsh deposits
- Marshalltown Formation
- Merchantville Formation
- Metapyroxenite and metagabbro (undifferentiated)
- Middletown
- Mill Creek Metagabbro
- Mount Laurel Formation
- Navesink Formation
- New Castle County
- Newark
- Odessa
- Old College Formation
- Pegmatite
- Perkins Run Gabbronorite Suite
- Potomac Formation
- Quantum GIS
- Rockford Park Gneiss
- rocks
- Scotts Corners Formation
- Serpentinite
- Setters Formation
- Shark River Formation
- surficial geology
- swamp deposits
- undrained depression deposits
- Vincentown Formation
- WFS Feature Service
- Wilmington
- Wilmington Complex
- Wissahickon Formation
- WMS Map Service
- Shapefile
DGS Publications
The core of much DGS work culminates in the release of data and findings in official DGS publications, including Open File Reports, Reports of Investigations, Geologic Maps, Hydrologic Maps, and Bulletins.



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


