Maryland interactive geologic map, Includes all rocks above the Freeport Coal, to the base of the Pittsburgh coal. Sediment eroding from Alleghanian Highlands and rapidly fluctuating sea levels from repeated glacial and interglacial episodes. A more detailed version compiled by Cleaves, Edwards, and Glaser (1968) can be viewed by clicking here. S. The columns can be set to ascending or descending order by clicking on the column title. Document Info: Title: Maryland Geology Author: Comments: Polygon boundries of various geological features in Maryland including: geologic formations, physiographic regions and hydric soils. The map below is a generalized version of the geologic map of Maryland. MD iMAP: Maryland Geology - Geologic Formations | Open Data | opendata. . See layer details for credits for individual layers.


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