Stratigraphic range: Frasnian - Famennian
|Sub-units||Black Creek Siltstone Member, Minnehaha Springs Member|
|Underlies||Greenland Gap Group and Scherr Formation|
|Thickness||1350 to 1800 feet in central PA|
|Extent||Maryland, Pennsylvania, Virginia, and West Virginia|
|Named by||Charles Butts, 1918|
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.
The Brallier is roughly equivalent to the Scherr Formation.
The contact with the underlying Harrell Formation is generally gradational.
- Bivalvia: Buchiola retrostriata, Paracardium doris, Pterochaenia fragilis
- Cephalopoda: Bactrites, Orthoceras filosum
- Cricoconarida (class of Mollusca): Styliolina fissurella
- Annelida: Pteridichnites biseriatus
Relative age dating places the Brallier in the late Devonian.
- Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
- Avary, K.L., and Dennison, J.M., 1980, Back Creek Siltstone Member of Devonian Brallier Formation in Virginia and West Virginia: Southeastern Geology, v. 21, no. 2, p. 121-153.
- Lyke, W.L., 1986, The stratigraphy, paleogeography, depositional environment, faunal communities, and general petrology of the Minnehaha Springs Member of the Scherr Formation: Southeastern Geology, v. 26, no. 3, p. 173-192.
- Butts, Charles, 1918, Geologic section of Blair and Huntingdon Counties, central Pennsylvania: American Journal of Science, 4th series, v. 46, p. 523-537.
- 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 
|This article about a specific stratigraphic formation in the United States is a stub. You can help Wikipedia by expanding it.|