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Key
Cambrian -Antietam Formation �\\`
Cambrian - Elkbrook Limestone
Cambrian -Tomstown Formation
Cambrian - Waynesboro Formation
Devonian- Helderberg Formation
Devonian- Chemung Formation
Devonian- Chemung Formation
Devonian - Hampshire Formation
Devonian - Oriskany Sandstone
Devonian - Parkhead Sandstone
Devonian - Romney Formation
Devonian - Woodmont Formation
Water
Mississippian - Purslane Sandstone
Mississippian - Rockwell Formation
Ordovician- Conococheague Limestone
Ordovician - Chambersburg Limestone
Ordovician - Juniata Formation
Ordovician - Martinsburg Shale
Ordovician - Pinesburg Station Dolomite
Ordovician - Rockdale Run Formation
Ordivician- Stonehenge Limestone
Ordivician- St. Paul Group
Quaternary - Alluvium
Quaternary - Colluvium
Quaternary - Terrace Gravel
Silurian -Bloomsburg Formation
Silurian - Keefer Sandstone
Silurian - McKenzie Formation
Silurian - Rose Hill Formation
Silurian - Tuscarora Sandstone
Silurian - Tonoloway Formation
Silurian - Wills Creek Shale
Triassic - Diabase
Late Precambrian or Cambrii - Harpers Formation
Late PreCambrian or Cambrian - Loudoun Formation
Late PreCambrian - Catoctin Formation
Late PreCambrian - Catoctin Formation
Late PreCambrian - Catoctin Formation
Late Prec ambriam - Catoctin Formation
PreCambrian - Gneiss Complex
Late PreCambrian or Cambrian - Weverton Formation
Data Sources:
MD Dept of Natural Resources
Washington County Planning Dept
Geologic Features
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Map 40
Comprehensive Plan
for
Washington County,
Maryland
2002
Note: This map is prepared for the sole purpose
of illustrating the Comprehensive Plan.
It should not be used for other purposes. Scale N Prepared by the
Information shown on this map was compiled
from various original sources as listed and is , p 012 3 4 5 6 Z8 91 Miles Washington County
subject to change as source data changes. _ Planning Department
P:\policy\compplan\Chapter8.apr s Adopted 8-27-2002 Geographic Information System
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