Weverton Formation
| Weverton Formation | |
|---|---|
| Stratigraphic range: Cambrian | |
| Type | Formation |
| Unit of | Chilhowee Group [1] |
| Sub-units | Buzzard Knob Member, Maryland Heights Member, and Owens Creek Member[2] |
| Underlies | Harpers Formation |
| Overlies | Catoctin Formation and London Conglomerate |
| Lithology | |
| Primary | sandstone, quartzite, |
| Other | shale, siltstone |
| Location | |
| Region | Appalachia, Mid-Atlantic United States, and Southeastern United States |
| Country | United States |
| Extent | Maryland, Pennsylvania, Virginia, and West Virginia [3] |
| Type section | |
| Named for | Weverton, Maryland |
The Weverton Formation is a quartzite geologic formation in Maryland, Virginia, West Virginia, and Pennsylvania. It is considered the basal member of the Chilhowee Group.[1] The Weverton Formation dates back to the Cambrian period.
Description
[edit ]The Weverton Formation is composed of three members: the Buzzard Knob Member, Maryland Heights Member, and Owens Creek Member.[2] The Buzzard Knob member is a coarse-grained quartzite with pervasive cross-beds. The Maryland Heights member consists of metamorphosed siltstone, coarse-grained metamorphosed greywacke, and quartzite. The Owens Creek Member is a coarse-grained to conglomeratic metamorphosed greywacke.[2] [4] The formation was deposited in an alluvial environment.[4]
The Weverton Formation is considered the main ridge forming unit in the Blue Ridge Mountains of Maryland.[2]
History
[edit ]The Weverton Formation is sometimes incorrectly spelled Weaverton and has been called the Weverton Sandstone or the Weverton Quartzite.[1] [5] [6] It was divided into three members originally called the lower, middle, and upper member.[1] [2] These members were informally called the Loft Mountain Member, the Oregon Hollow Member, and the Dismal Hollow Member before receiving their formal names in 1992.[2]
References
[edit ]- ^ a b c d King, Philip B. (1950). "Geology of the Elkton area, Virginia" (PDF). U.S. Geological Survey Professional Paper. 230: 17–19. Retrieved 29 June 2018.
- ^ a b c d e f Brezinski, David K. (1992). "Lithostratigraphy of the western Blue Ridge cover rocks in Maryland" (PDF). Maryland Geological Survey Report of Investigations. 55: 9–18. Retrieved 29 June 2018.
- ^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
- ^ a b Southworth, Scott; Brezinski, Donald K. (1996). "Geology of the Harpers Ferry quadrangle, Virginia, Maryland, and West Virginia" (PDF). U.S. Geological Survey Bulletin. 2123: 12–13. Retrieved 29 June 2018.
- ^ Williams, G. H.; Clark, W. B. (1893). Maryland, its resources, industries, and institutions; geology. Baltimore, MC: Sun job printing office. p. 68. Retrieved 29 June 2018.
- ^ Burton, William C.; Froelich, Albert J.; Pomeroy, John S.; Lee, K. Y. (1995). "Geology of the Waterford quadrangle, Virginia and Maryland, and the Virginia part of the Point of Rocks quadrangle" (PDF). U.S. Geological Survey Bulletin. 2095: 15–16. Retrieved 29 June 2018.
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