Brallier Formation facts for kids
Quick facts for kidsBrallier Formation
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
A large exposure is located in Huntingdon, Pennsylvania, along the ramp from U.S. Route 22 west to Route 26 north.
Relative age dating places the Brallier in the late Devonian.
Brallier Formation Facts for Kids. Kiddle Encyclopedia.