Tomstown Dolomite

Interbedded light gray to yellowish-gray, thin- to thick-bedded dolomite and limestone; some shale layers; gradational contact with Antietam; thickness 200 to 1,000 feet.
State Maryland
Name Tomstown Dolomite
Geologic age Cambrian
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone
Minor
Sedimentary > Carbonate > Limestone
Incidental
Sedimentary > Clastic > Mudstone > Shale
References

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 http://www.mgs.md.gov/.

NGMDB product
Counties Frederick - Washington