Rockwell Formation
The Rockwell Formation is a late Devonian and early Mississippian mapped bedrock unit in West Virginia, Maryland, and Pennsylvania, in the United States.
| Rockwell Formation | |
|---|---|
| Stratigraphic range: Late Devonian to Early Mississippian | |
 Rockwell Formation at Sideling Hill, I-68 roadcut | |
| Type | Sedimentary |
| Sub-units | Finzel Tongue,[1] Patton Shale, Riddlesburg Shale[2] |
| Underlies | Pocono Formation and Purselane Sandstone |
| Overlies | Hampshire Formation |
| Thickness | 500 to 540 feet in WV,[3] 540 to 550 feet at Sideling Hill[4] |
| Lithology | |
| Primary | Sandstone, shale, conglomerate |
| Location | |
| Region | Appalachian Mountains |
| Extent | West Virginia, Maryland, Pennsylvania |
| Type section | |
| Named for | Rockwell Run, West Virginia |
| Named by | Stose and Swartz, 1912[3] |
Description
The Rockwell Formation was described at its type section at Rockwell Run in West Virginia as soft arkosic sandstone, fine hard conglomerate, and buff hackly shale.[3]
The formation was originally described in West Virginia by Stose and Swartz (1912).[3] It was first described in Maryland by H. E. Vokes (1957),[4] and later described in central Pennsylvania by C. R. Wood (1980).[5]
Stratigraphy
The Rockwell is generally considered a Formation. At Formation rank, it has several members, including the Patton and Riddlesburg Shale Members,[2] and the Finzel Tongue.[1]
It has been reduced in rank to a member of the Price Formation in West Virginia.[2]
The Rockwell is a lateral equivalent of the Huntley Mountain Formation and the Spechty Kopf Formation, as all three underlie the prominent Pocono Formation and its lateral equivalent, the Burgoon Sandstone.
Lessing, Dean, and Kulander (1992) mapped the Meadow Branch synclinorium in Berkeley County, West Virginia, and noted that the Rockwell is approximately 200 meters thick here and that a 2-meter thick diamictite is present near the base.[6]
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References
- Dennison, J.M., Beuthin, J.D., and Hasson, K.O., 1986, Latest Devonian-earliest Carboniferous marine transgressions central and southern Appalachians, USA, IN Bless, M.J., and Streel, M., eds., Late Devonian events around the Old Red Continent; field conference in Aachen (FRG), with excursions in the Ardenne (Belgium), the Rheinisches Schiefergebirge (FRG) and in Moravia (USSR): Annales de la Societe Geologique de Belgique, Aachen, Federal Republic of Germany, April 6–14, 1986, v. 109, no. 1, p. 123-129.
- Kammer, T.W., and Bjerstedt, T.W., 1986, Stratigraphic framework of the Price Formation (Upper Devonian-Lower Mississippian) in West Virginia: Southeastern Geology, v. 27, no. 1, p. 13-33.
- Stose, G.W., and Swartz, C.K., 1912, Description of the Pawpaw and Hancock quadrangles (Maryland-West Virginia-Pennsylvania): U.S. Geological Survey Geologic Atlas of the United States, Pawpaw-Hancock folio, no. 179, p. 24.
- Vokes, H.E., 1957, Geography and geology of Maryland: Maryland Geological Survey Bulletin, no. 19, p. 243.
- Wood, C.R., 1980, Summary groundwater resources of Centre County, Pennsylvania: Pennsylvania Geological Survey Water Resource Report, 4th series, no. 48, p. 60.
- Lessing, Peter, Dean, S.L., and Kulander, B.R., 1992, Stratigraphy and structure of Meadow Branch synclinorium, West Virginia: Southeastern Geology, v. 32, no. 3, p. 166-174.