1. Mineral Resources
  2. Online Spatial Data
  3. Geology
  4. by state
  5. Maryland

Catoctin Metabasalt

XML
JSON
Shapefile
Thick-bedded metabasalt with amygdaloidal layers and secondary veins of quartz, calcite, and epidote; interbedded green tuffaceous phyllite and blue amygdaloidal metaandesite.
State Maryland
Name Catoctin Metabasalt
Geologic age Late Precambrian
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > MetabasaltThick-bedded metabasalt with amygdaloidal layers and secondary veins of quartz, calcite, and epidote
Minor
Metamorphic > Metaigneous > Metavolcanic > Metaandesiteblue amygdaloidal metaandesite
Metamorphic > Metasedimentary > Metaclastic > Phyllitegreen tuffaceous phyllite
Comments Age of Catoctin Formation changed to Late Proterozoic and Early Cambrian based on isotopic age of 570 +/-36 Ma (Badger and Sinha, 1988). (see USGS Geologic Names lexicon [ref. MD004])
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/.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search
NGMDB product
Counties Frederick - Washington