Coastal & Estuarine Geology Program Navigation buttonsGeologic Maps of Maryland
Howard 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Caution: These images were scanned from a paper copy of the out-of-print and outdated 1968 Geologic Map of Maryland.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 geologic map (1993) and a topographic map (1974) of Howard County are available through our List of Publications.

Click on a tile to display information about the associated rock types or formations.
Click on an area of the map to view greater detail.
Wissahickon Formation (Late Precambrian ?) Boulder Gneiss (Late Precambrian ?) Setters Formation (Late Precambrian ?) Baltimore Gneiss  (Precambrian) Pegmatite Dikes (Paleozoic) Diabase Sills and Dikes (Triassic) Marburg Schist (Late Precambrian ?) Norbeck Quartz Diorite (Paleozoic) Relay Quartz Diorite (Early Paleozoic- Late Precambrian ?) Lowland Deposits (Quaternary)
Upper Pelitic Schist  (Late Precambrian ?) Lower Pelitic Schist  (Late Precambrian ?) Cockeysville Marble (Late Precambrian ?) Ultramafic Rocks (Early Paleozoic- Late Precambrian ?) Baltimore Gabbro Complex  (Early Paleozoic- Late Precambrian ?) Ijamville Formation / Marburg Schist (Late Precambrian ?) Ellicott City Granodiorite (Paleozoic) Guilford Quatrz Monzonite (Paleozoic) Potomac Group (Cretaceous)  
Geologic Map of Howard County (1968) Click for a closer view Click for a closer view Click for a closer view Click for a closer view


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Updated 6/26/00

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