Coastal & Estuarine Geology Program Navigation buttonsGeologic Maps of Maryland
Washington County (1968)

Caution: These images were scanned from a paper copy of the out-of-print and outdated 1968 Geologic Map of Maryland. Due to the age of this map, these images do not necessarily represent an accurate interpretation of currently accepted geologic theory. Because the projection of the original map was distorted during reproduction, and the paper medium is not stable, these images do not meet any cartographic standards. Therefore geographic or Cartesian coordinates cannot be applied to these images, and georeferencing is not possible.

These images are for illustration purposes only. Do not use these documents for GIS, navigation, legal purposes, surveying, or anything else other than document illustrations. They were created only to illustrate our publications and are not accurate enough to be used for any other purposes. You may use them as illustrations only, and you must give proper credit to Maryland Geological Survey when using these maps.

A detailed paper map of Washington County geology (1978) and a newer topographic map (1992) are available through our List of Publications.

Click on a tile to display information about the associated rock types or formations. Click an area to view finer details.
Diabase Sills and Dikes (Triassic) Pinesburg Station Dolomite (Ordovician) Rockdale Run Formation (Ordovician) Stonehenge Limestone (Ordovician) Conococheague Limestone (Cambro-Ordovician) Elbrook Limestone (Cambrain) Waynesboro Formation (Cambrain) Tomstown Dolomite (Cambrian) Antietam Formation (Cambrian) Harpers Formation  (Cambrian) Weverton Formation (Late Precambrian ?) Loudoun Formation (Late Precambrian ?) Metarhyolite and Associated Pyroclastic Sediments (Late Precambrian ?) Catoctin Metabasalt (Late Precambrian ?) Granodiorite and Biotite Granite Gneiss (Precambrian)  
Pocono Group (Mississippian) Click for a closer view Click for a closer view Click for a closer view
Hampshire Formation (Devonian)
"Chemung" Formation, Parkhead Sandstone, Brallier Formation, Harrell Shale (Devonian)
Hamilton Group (Devonian)
Oriskany Group (Devonian)
Helderburg Formation and Keyser Limestone (Devonian-Silurian)
Tonoloway Formation (Silurian)
Wills Creek Shale and Bloomsburg Formation (Silurian)
McKenzie Formation (Silurian)
Clinton Group (Silurian)
Tuscarora Sandstone (Silurian)
Juniata Formation (Ordovician)
Martinsburg Formation (Ordovician)
Chambersburg Limestone (Ordovician)

Use your browser's SAVE feature to save this map. Place your mouse over the map and click your RIGHT mouse button (or the Left button if you have set up your mouse as a left-handed mouse). A pop-up menu will appear. Select "Save image as.." (Netscape) or "Save picture as.." (IE) and type in a name for the map in the FILE NAME dialog box. Once saved, you can resize this image with your favorite graphics software.

Updated 6/5/00

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