Pocono Formation

{{Infobox rockunit

| name = Pocono Formation

| image = Ricketts Glen State Park Pocono Formation.jpg

| caption = Outcrop at Ricketts Glen State Park

| type = sedimentary

| age = Early Mississippian

| period = Mississippian

| prilithology = Quartzarenite (sandstone)

| otherlithology = Conglomerate

| namedfor =

| namedby = Lesley, 1876

| region = Appalachian Mountains

| country =

| coordinates =

| unitof =

| subunits =

| underlies = Mauch Chunk Formation

| overlies = Catskill Formation, Huntley Mountain Formation, Rockwell Formation, and Spechty Kopf Formation

| thickness =

| extent = Pennsylvania and Virginia[http://hdl.handle.net/10919/19078 Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau]

| area =

| map =

| map_caption =

}}

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,{{Cite web|url=http://www.mgs.md.gov/esic/geo/lgdalleg.html|title=Geologic Maps of Maryland|website=www.mgs.md.gov|accessdate=January 31, 2024}}

and the upper part of the Pocono Formation is sometimes called the Burgoon Formation or Burgoon Sandstone in Pennsylvania.{{cite book |title= Roadside Geology of Pennsylvania |last= Van Diver |first= Bradford B. |year= 1990 |publisher= Mountain Press Publishing Company |location= Missoula, Montana |isbn= 0-87842-227-7 |pages= 83}}{{cite web | url = https://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=PAMb%3B10 | title = Burgoon Sandstone | publisher = United States Geological Survey | date = May 22, 2009 | access-date = June 8, 2009}}

The Pocono is a major ridge-former In the Ridge-and-Valley Appalachians of the eastern United States{{cite web |url=http://daac.gsfc.nasa.gov/geomorphology/GEO_2/GEO_PLATE_T-12.shtml |title=Geomorphology : Chapter 2 Plate T-12 : Folded Appalachians |date=2007-01-19 |access-date=2008-03-16 |publisher=NASA, Goddard Earth Sciences (GES), Data and Information Services Center (DISC) |first=Steve |last=Kempler |quote=The major ridge makers are the Tuscarora (T), Pocono (Po), and Pottsville (Pt) Formations. |url-status=dead |archive-url=https://web.archive.org/web/20071206035036/http://daac.gsfc.nasa.gov/geomorphology/GEO_2/GEO_PLATE_T-12.shtml |archive-date=2007-12-06 }}

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.Brezinski, D.K., 1989, The Mississippian System in Maryland: Maryland Geological Survey Report of Investigations, no. 52, 75 p.

Description

The Pocono is a dominantly gray color with quartzitic medium to coarse-grained sandstones. The base of the Pocono Formation is marked by conglomerate.{{cite web |url=http://www.leo.lehigh.edu/envirosci/geology/gorge/m_p.html |title=Geology : Pocono (Mp) |access-date=2008-03-16 |work=LEO EnviroSci Inquiry |publisher=Lehigh University |url-status=dead |archive-url=https://web.archive.org/web/20070712122533/http://www.leo.lehigh.edu/envirosci/geology/gorge/m_p.html |archive-date=2007-07-12 }}

File:Sideling Hill cut MD1.jpg

=Notable exposures=

Age

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.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

References