| Dunkard Group | |
|---|---|
| Stratigraphic range: Pennsylvanian-Permian | |
_10_(31206070732).jpg) Sandstone (Greene Formation, Dunkard Group, Lower Permian; Monroe County, Ohio) | |
| Type | Group |
| Sub-units | Greene Formation, Washington Formation, Waynesburg 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 |
| Type section | |
| Named for | Dunkard Creek |
| Named by | I.C. White in 1891 |
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] In Ohio, 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.
- ^ 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.
- ^ "Allegheny Plateau and Valley and Ridge". Geologic Map of Maryland. Maryland Geological Survey. 1968. Retrieved 2008-01-26.