Geologic Map of Maryland (1968) Index

To view a map click on a county in the index map below or the list to the right

* These maps have been divided into smaller sections for better detail. Click on an area of the map to view these details.

The following maps are provided by the Maryland Geological Survey, and are from the out-of-print 1968 Geologic Map of Maryland. If you need a more up-to-date map, or paper copies of individual Maryland counties, please see the on-line List of Publications for geologic and topographic maps of Maryland counties.

⁽¹⁾ Please note the changes in the former "Wissahickon formation" nomenclature are presented on the Eastern Piedmont Metasedimentary Rocks page.