Edinburg Formation
(Redirected from Edinburgh Formation)
| Edinburg Formation | |
|---|---|
| Stratigraphic range: Late Ordovician | |
| File:Edinburg Formation along C&O RR Staunton VA.jpg Outcrop along tracks of the C&O Railway near Staunton | |
| Type | sedimentary |
| Sub-units | Botetourt limestone member, St. Luke limestone member |
| Underlies | Martinsburg Formation |
| Overlies | Lincolnshire Formation |
| Area | Virginia |
| Thickness | 1200 feet[1] |
| Lithology | |
| Primary | limestone, shale |
| Location | |
| Region | Great Appalachian Valley |
| Country | United States |
| Type section | |
| Named for | Edinburg, Virginia |
| Named by | Cooper & Cooper, 1946 |
The Edinburg Formation is an Ordovician-age geological formation in Virginia. It is primarily composed of basinal (deep sea) limestone and shale, and is one of the younger units in the "Middle Ordovician" sequence of the Shenandoah Valley. However, fossils have shown that it actually was deposited in the early part of the Late Ordovician. There are two major facies encompassed by the Edinburg Formation. The more abundant Liberty Hall facies consist of evenly bedded black limestone and shale. In a few areas, the Liberty Hall facies intertongue with the Lantz Mill facies. The Lantz Mill facies are grainy or cobbly wackestone which weathers to a buff brown color. Fossils are diverse, including graptolites, brachiopods, and trilobites.[2][3]
References
[edit | edit source]- ^ Eugene K. Rader, 1967. Geology of Staunton, Churchville, Greenville, and Stuarts Draft quadrangles, Virginia. Virginia Division of Mineral Resources, Report of Investigations 12. Map Scale: 1:24,000.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
