Pocono Formation
| Pocono Formation | |
|---|---|
| Stratigraphic range: Early Mississippian | |
 Outcrop at Ricketts Glen State Park | |
| Type | sedimentary |
| Underlies | Mauch Chunk Formation |
| Overlies | Catskill Formation, Huntley Mountain Formation, Rockwell Formation, and Spechty Kopf Formation |
| Lithology | |
| Primary | Quartzarenite (sandstone) |
| Other | Conglomerate |
| Location | |
| Region | Appalachian Mountains |
| Extent | Pennsylvania and Virginia[1] |
| Type section | |
| Named by | Lesley, 1876 |
The Mississippian Pocono Formation 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,[2] and the upper part of the Pocono Formation is sometimes called the Burgoon Formation or Burgoon Sandstone in Pennsylvania.[3][4] The Pocono is a major ridge-former In the Ridge-and-Valley Appalachians of the eastern United States[5]
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.[6]
Description
[edit | edit source]The Pocono is a dominantly gray color with quartzitic medium to coarse-grained sandstones. The base of the Pocono Formation is marked by conglomerate.[7]
Notable exposures
[edit | edit source]- The type section of the Burgoon Sandstone is in the valley of Burgoon Run, above Kittanning Point, Blair County, Pennsylvania.
- A spectacular exposure of the Purslane Sandstone (equivalent to the Pocono) is at the I-68 road cut through Sideling Hill in Maryland.
Age
[edit | edit source]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.[8]
See also
[edit | edit source]References
[edit | edit source]- ^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
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- ^ Brezinski, D.K., 1989, The Mississippian System in Maryland: Maryland Geological Survey Report of Investigations, no. 52, 75 p.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ 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.
External links
[edit | edit source]Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
- Geologic formations of Pennsylvania
- Geologic formations of West Virginia
- Geologic formations of Maryland
- Carboniferous System of North America
- Conglomerate formations of the United States
- Sandstone formations of the United States
- Mississippian United States
- Carboniferous geology of Pennsylvania
- Carboniferous West Virginia
- Carboniferous Maryland
- Devonian geology of Pennsylvania
- Devonian Maryland
- Devonian West Virginia
- Cliff-formers
- Devonian southern paleotemperate deposits
- Carboniferous southern paleotemperate deposits
- Carboniferous southern paleotropical deposits
- United States geologic formation stubs