Stonehenge Limestone

Upper part gray, thin-bedded, coarse-grained to conglomeratic, oolitic calcarenite; some dolomite; lower part gray, thick-bedded, fine-grained algal limestone; thickness 500 to 800 feet.
State Maryland
Name Stonehenge Limestone
Geologic age Ordovician
Lithologic constituents
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Sandstone > Arenite > Calcarenite
Sedimentary > Carbonate > Dolostone
Stratigraphic units Beckmantown Group

Cleaves, E.T., Edwards, J., Jr., and Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.

In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at

NGMDB product
Counties Washington