Neha Patil (Editor)

Brallier Formation

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Type  sedimentary
Named by  Charles Butts, 1918
Overlies  Harrell Formation
Country  United States
Region  Appalachian Mountains
Primary  Slate, Sandstone
Brallier Formation httpsuploadwikimediaorgwikipediacommonsthu
Sub-units  Black Creek Siltstone Member, Minnehaha Springs Member
Thickness  1350 to 1800 feet in central PA

The Devonian Brallier Formation is a mapped bedrock unit in Pennsylvania, Maryland, West Virginia, and Virginia.

Contents

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:

  • Bivalvia: Buchiola retrostriata, Paracardium doris, Pterochaenia fragilis
  • Cephalopoda: Bactrites, Orthoceras filosum
  • Cricoconarida: Styliolina fissurella
  • Annelida: Pteridichnites biseriatus
  • Notable Exposures

    Type locality is at a railway station 6 miles northeast of Everett, Bedford County, Pennsylvania.

    Age

    Relative age dating places the Brallier in the late Devonian.

    References

    Brallier Formation Wikipedia


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