Coastal & Estuarine Geology Program Navigation buttonsGeologic Maps of Maryland
Baltimore 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Caution: These images were scanned from a paper copy of the out-of-print and outdated 1968 Geologic Map of Maryland.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 newer map of Baltimore County geology (1976) and topography (1985) is available through our List of Publications.

Click on a tile to display information about the associated rock types or formations.
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Baltimore County Geologic Map (1968)
Pegmatite Dikes (Paleozoic) Diabase Sills and Dikes (Triassic)
Woodstock Quartz Monzonite (Paleozoic) Baltimore Gneiss  (Precambrian)
Wissahickon Formation Undifferentiated (Late Precambrian ?) Volcanic Complex of Cecil County  (Late Precambrian ?)
Upper Pelitic Schist  (Late Precambrian ?) James Run Formation  (Late Precambrian ?)
Metagraywacke (Late Precambrian ?) Ellicott City Granodiorite (Paleozoic)
Metaconglomerate  (Late Precambrian ?) Gunpowder Granite (Paleozoic)
Boulder Gneiss (Late Precambrian ?) Port Deposit Gneiss (Paleozoic)
Lower Pelitic Schist  (Late Precambrian ?) Relay Quartz Diorite (Early Paleozoic- Late Precambrian ?)
Cockeysville Marble (Late Precambrian ?) Potomac Group (Cretaceous)
Setters Formation (Late Precambrian ?) Upland Deposits -Western Shore (Quaternary)
Ultramafic Rocks (Early Paleozoic- Late Precambrian ?) Lowland Deposits (Quaternary)
Baltimore Gabbro Complex  (Early Paleozoic- Late Precambrian ?)  

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Updated 6/2/00

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