Pocono Formation

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Pocono Formation
Stratigraphic range: Early Mississippian
Type sedimentary
Overlies Rockwell Formation/Spechty Kopf Formation/Huntley Mountain Formation
Lithology
Primary quartzarenite (sandstone)
Other conglomerate
Location
Region Appalachian Mountains
Extent Pennsylvania
Type section
Named by Lesley, 1876

The Mississippian Pocono Formation (Mp) is a mapped bedrock unit in Pennsylvania, Maryland, and West Virginia, in the United States. It is also known as the Pocono Group in Maryland and West Virginia,[1] and the upper part of the Pocono Formation is sometimes called the Burgoon Formation or Burgoon Sandstone in Pennsylvania.[2][3] The Pocono is a major ridge-former In the Ridge-and-Valley Appalachians of the eastern United States[4]

The Pocono is also a lateral equivalent of the Purslane Sandstone in Maryland and West Virginia. D. Brezinski of Maryland Geological Survey recommended abandoning use of the term Pocono in Maryland in favor of "Purslane" in 1989.[5]

Description[edit]

The Pocono is a dominantly gray color with quartzitic medium to coarse-grained sandstones. The base of the Pocono Formation is marked by conglomerate.[6]

Notable exposures[edit]

Age[edit]

Relative age dating of the Pocono places it in the lower Mississippian period. The lower boundary is with the Spetchy Kopf Formation and Huntley Mountain Formation. In South-central Pennsylvania, the Pocono often interfingers with the Rockwell Formation.[7]

References[edit]

  1. ^ Geologic Maps of Maryland:
  2. ^ Van Diver, Bradford B. (1990). Roadside Geology of Pennsylvania. Missoula, Montana: Mountain Press Publishing Company. p. 83. ISBN 0-87842-227-7. 
  3. ^ "Burgoon Sandstone". United States Geological Survey. May 22, 2009. Retrieved June 8, 2009. 
  4. ^ Kempler, Steve (2007-01-19). "Geomorphology : Chapter 2 Plate T-12 : Folded Appalachians". NASA, Goddard Earth Sciences (GES), Data and Information Services Center (DISC). Retrieved 2008-03-16. The major ridge makers are the Tuscarora (T), Pocono (Po), and Pottsville (Pt) Formations. 
  5. ^ Brezinski, D.K., 1989, The Mississippian System in Maryland: Maryland Geological Survey Report of Investigations, no. 52, 75 p.
  6. ^ "Geology : Pocono (Mp)". LEO EnviroSci Inquiry. Lehigh University. Retrieved 2008-03-16. 
  7. ^ Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.

See also[edit]