Английская Википедия:Brallier Formation
Шаблон:Short description Шаблон:Infobox rockunit The Devonian Brallier Formation is a mapped bedrock unit in Pennsylvania, Maryland, West Virginia, and Virginia.
Description
The Brallier Formation was described by Charles Butts in 1918 as a fine-grained, siliceous shale with few fine-grained sandstone layers, from outcrops in central Pennsylvania. Others expanded usage of the term to rocks in other states.
Stratigraphy
The Brallier is roughly equivalent to the Scherr Formation.
The contact with the underlying Harrell Formation is generally gradational.
Fossils
Hasson and Dennison reported the following fossils from outcrops of the lower Brallier at Keyser, West Virginia, Ridgeville, West Virginia, and McCoole, Maryland:[1]
- Bivalvia: Buchiola retrostriata, Paracardium doris, Pterochaenia fragilis
- Cephalopoda: Bactrites, Orthoceras filosum
- Cricoconarida (class of Mollusca): Styliolina fissurella
- Annelida: Pteridichnites biseriatus
Notable Exposures
Type locality is at a railway station 6 miles northeast of Everett, Bedford County, Pennsylvania.[2]
A large exposure is located in Huntingdon, Pennsylvania, along the ramp from U.S. Route 22 west to Route 26 north.[3]
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Part of the exposure at Huntingdon (2017)
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Another view at Huntingdon (1924)
Another good exposure is on the Pennsylvania Railroad bed just west of Altoona, Pennsylvania.[3]
Age
Relative age dating places the Brallier in the late Devonian.
References
Шаблон:Chronostratigraphy of Maryland Шаблон:Chronostratigraphy of Pennsylvania Шаблон:Chronostratigraphy of Virginia Шаблон:Stratigraphic column of West Virginia
Шаблон:US-geologic-formation-stub
- ↑ Hasson, Kenneth O., and Dennison, John M., 1978, STRATIGRAPHY OF THE DEVONIAN HARRELL AND MILLBORO SHALES IN PARTS OF PENNSYLVANIA, MARYLAND, WEST VIRGINIA, AND VIRGINIA, Project Final Report for Energy Research and Development Administration Contract #EY-77-C-21-8153, May 1978 [1]
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокButts1918не указан текст - ↑ 3,0 3,1 Charles Butts, 1945. Hollidaysburg-Huntingdon folio, Pennsylvania, Folios of the Geologic Atlas 227. United States Geological Survey.
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- Geologic formations of Maryland
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- Devonian Pennsylvania
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- Devonian System of North America
- Devonian Maryland
- Devonian geology of Pennsylvania
- Devonian geology of Virginia
- Devonian southern paleotemperate deposits
- Devonian West Virginia
- Frasnian Stage
- Famennian Stage
- Shale formations of the United States
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