| 词条 | Pocono Formation |
| 释义 |
| 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[1] | 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,[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] DescriptionThe 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
AgeRelative 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] References1. ^[https://vtechworks.lib.vt.edu/bitstream/handle/10919/19078/Read%20and%20Eriksson.pdf?sequence=1 Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau] 2. ^Geologic Maps of Maryland: 3. ^{{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}} 4. ^{{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 | accessdate = June 8, 2009}} 5. ^{{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 |accessdate=2008-03-16 |publisher=NASA, Goddard Earth Sciences (GES), Data and Information Services Center (DISC) |first=Steve |last=Kempler |work= |quote=The major ridge makers are the Tuscarora (T), Pocono (Po), and Pottsville (Pt) Formations. |deadurl=yes |archiveurl=https://web.archive.org/web/20071206035036/http://daac.gsfc.nasa.gov/geomorphology/GEO_2/GEO_PLATE_T-12.shtml |archivedate=2007-12-06 |df= }} 6. ^Brezinski, D.K., 1989, The Mississippian System in Maryland: Maryland Geological Survey Report of Investigations, no. 52, 75 p. 7. ^{{cite web |url=http://www.leo.lehigh.edu/envirosci/geology/gorge/m_p.html |title=Geology : Pocono (Mp) |accessdate=2008-03-16 |work=LEO EnviroSci Inquiry |publisher=Lehigh University |deadurl=yes |archiveurl=https://web.archive.org/web/20070712122533/http://www.leo.lehigh.edu/envirosci/geology/gorge/m_p.html |archivedate=2007-07-12 |df= }} 8. ^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
18 : Geologic formations of Pennsylvania|Geologic formations of West Virginia|Geologic formations of Maryland|Carboniferous System of North America|Mississippian Series|Conglomerate formations|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 |
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