Coastal & Estuarine Geology Program Navigation buttonsGeologic Maps of Maryland
Harford 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Caution: These images were scanned from a paper copy of the out-of-print and outdated 1968 Geologic Map of Maryland.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 Harford County geology (1968) and a newer topographic map (1988) are available through our List of Publications.

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Wissahickon Formation Undifferentiated (Late Precambrian ?) Baltimore Gabbro Complex  (Early Paleozoic- Late Precambrian ?)
Upper Pelitic Schist  (Late Precambrian ?) Volcanic Complex of Cecil County  (Late Precambrian ?)
Metagraywacke (Late Precambrian ?) Port Deposit Gneiss (Paleozoic)
Metaconglomerate  (Late Precambrian ?) Muscovite Quartz Monzonite Gneiss (Harford County Paleozoic)
Boulder Gneiss (Late Precambrian ?) Quartz Gabbro and Quartz Diorite Gneiss (Harford County Paleozoic)
Lower Pelitic Schist  (Late Precambrian ?) James Run Formation  (Late Precambrian ?)
Cockeysville Marble (Late Precambrian ?) Peach Bottom Slate (Ordovician)
Baltimore Gneiss  (Precambrian) Cardiff Metaconglomerate (Ordovician)
Setters Formation (Late Precambrian ?) Diabase Sills and Dikes (Triassic)
Metagabbro and Amphibolite (Early Paleozoic ?) Potomac Group (Cretaceous)
Ultramafic and Gabbroic Rocks (Early Paleozoic ?) Upland Deposits -Western Shore (Quaternary)
Ultramafic Rocks (Early Paleozoic- Late Precambrian ?) Lowland Deposits (Quaternary)

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Updated 1/29/01

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