Reedsville Formation
Template:Short description Script error: No such module "Infobox".Template:Template otherScript error: No such module "check for unknown parameters". The Ordovician Reedsville Formation is a mapped surficial bedrock unit in Pennsylvania, Maryland, Virginia, West Virginia, and Tennessee, that extends into the subsurface of Ohio. This rock is a slope-former adjacent to (and stratigraphically below) the prominent ridge-forming Bald Eagle sandstone unit in the Appalachian Mountains. It is often abbreviated Or on geologic maps.
Description
The Reedsville Formation is an olive-gray to dark-gray siltstone, shale, and fine-grained sandstone.[1] In Central Pennsylvania along the Nittany Arch, and extending into the subsurface of northern West Virginia, the base of the Reedsville formation includes the black calcareous Antes Shale formation.[2]
Type section
The type locality is at Reedsville, Pennsylvania.
Age
Relative age dating of the Reedsville places it in the Upper Ordovician. It rests conformably atop the Upper Ordovician Coburn Formation at the top of the Trenton Group limestone and conformably below the Bald Eagle Formation.[3]
Isotopic dating of shale mylonite in Pennsylvania reveals a K-Ar age of 372+/-8 Ma.[4]
Economic uses
The Reedsville is quarried locally in borrow pits for road material and fill.[5]
Palaeontology
| Taxa | Class | Description | Images |
|---|---|---|---|
| Cephalopod |
References
- ↑ 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.
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- ↑ Lapham, D.M., and Root, S.I., 1971, Summary of isotopic age determinations in Pennsylvania: Pennsylvania Geological Survey Information Circular, 4th series, no. 70, 29 p.
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See also
Template:Chronostratigraphy of Virginia Template:Stratigraphic column of West Virginia
- Pages with script errors
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- Sandstone formations of the United States
- Shale formations of the United States
- Ordovician geology of Pennsylvania
- Ordovician Tennessee
- Ordovician West Virginia
- Ordovician southern paleotemperate deposits
- Ordovician Maryland
- Geologic formations of Maryland
- Ordovician geology of Virginia
- Geologic formations of Virginia
- Geologic formations of Tennessee