Dunkard Group
Dunkard Group Stratigraphic range: Pennsylvanian-Permian | |
---|---|
Type | Group |
Sub-units | Waynesburg Formation, Washington Formation[1] |
Underlies | Igneous intrusives |
Overlies | Monongahela Formation |
Lithology | |
Primary | Shale, sandstone, siltstone, coal |
Other | Limestone |
Location | |
Region | Ohio, Pennsylvania, West Virginia, and Maryland |
Country | United States |
The Permian Dunkard Group (Pd) is an area of rock, Early Permian in age, in the south of Ohio, southwestern Pennsylvania, West Virginia and the hilltops of the Georges Creek Basin of Maryland.[2] It is found primarily in Washington County. It is notable for being one of the few areas of Permian sediment east of the Mississippi River. In addition, it is the youngest surface rock in the state of Ohio.
Contents
1 Description
2 Fossil content
3 See also
4 References
5 Further reading
Description
It consists of red and green shale, siltstone, and sandstone, with thin lenticular beds of argillaceous limestone and thin beds of impure coal The base of the layer contains thick-bedded, white conglomeratic sandstone. The layer's thickness is greater than 200 feet in Maryland.[2]
The fossils found in the Dunkard Group are similar to ones found in Texas and Oklahoma of similar age.
Fossil content
- Dimetrodon
- Ctenospondylus
- Archaeothyris
- Edaphosaurus
- Eryops
- Xenacanthus
- Ophiacodon
- Diploceraspis
- Diplocaulus
- Baldwinonus
- Protorothyris
- Diadectes
- Isodectes
- Sagenodus
- Brachydectes
- Phlegethontia
See also
- Geology of Pennsylvania
References
^ Berryhill, Jr., Henry L.; Swanson, Vernon E. (1962). "Geological Survey research 1962; Short papers in geology and hydrology" (PDF). U. S Geological Survey Professional Paper. 450-C: 43–46. Retrieved 30 June 2018..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
^ ab "Allegheny Plateau and Valley and Ridge". Geologic Map of Maryland. Maryland Geological Survey. 1968. Retrieved 2008-01-26.
Further reading
Anstey, Robert L.; Feldmann, Rodney M.; Hackathorn, Merrianne (1996). Fossils of Ohio. Columbus: State of Ohio, Dept. of Natural Resources, Division of Geological Survey. ISBN 0-931079-05-5.
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