The Patapsco Formation is a geologic formation of varigated clays, sandy clays, and sand in Virginia, the District of Columbia, Maryland, Delaware, Pennsylvania, and in the subsurface of New Jersey.[1][2] It preserves fossils such as plants and molluscs dating back to the Cretaceous period.[1]

Patapsco Formation
Stratigraphic range: Albian–Cenomanian
Outcrop of the Patapsco Formation at Reynold's Mine, Anne Arundel County, Maryland showing the Arundel Formation overlain by the Patapsco Formation
TypeFormation
Unit ofPotomac Group
UnderliesRaritan Formation
OverliesArundel Formation
Thickness200 feet (60 m)
Lithology
Primaryclay, sand
Othersilt
Location
Region Virginia  Maryland
Country United States
Type section
Named forPatapsco River
Named byWilliam Bullock Clark (1897)[1]

See also

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References

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  1. ^ a b c Clark, W.B., 1897, Outline of present knowledge of the physical features of Maryland: Maryland Geological Survey Volume Series, v. 1, pt. 3, p. 172-188.
  2. ^ Richards, Horace G.; Olmstead, F. H.; Ruhle, James L. (1962). "Generalized structure contour maps of the New Jersey coastal plain" (PDF). New Jersey Geological Survey Reports. 4: 38. Retrieved 28 June 2018.