Warrior Formation
Geologic formation in Pennsylvania, United States
From Wikipedia, the free encyclopedia
The Cambrian Warrior Formation is a mapped limestone bedrock unit in Pennsylvania.
| Warrior Formation | |
|---|---|
| Stratigraphic range: Cambrian | |
Outcrop showing cryptozoa layers at Bakers Summit, Bedford County | |
| Type | sedimentary |
| Underlies | Gatesburg Formation |
| Overlies | Pleasant Hill Formation |
| Thickness | 250 ft at type sections,[1] 1350 ft in Nittany Arch,[2] 746 ft at Waddle.[3] |
| Lithology | |
| Primary | limestone |
| Other | shale, siltstone, sandstone |
| Location | |
| Region | Appalachian Basin |
| Country | United States |
| Extent | Bedford Co., Blair Co., Centre Co., Huntingdon Co.[4] |
| Type section | |
| Named for | Warrior Run, Blair County |
| Named by | C. Butts, 1918[1] |
Description
The Warrior Formation is described by Berg and others as gray, thin- to medium-bedded, fossiliferous, cyclic limestone bearing stromatolites, interbedded with shale, siltstone, and sandstone.[5]
Fossils
- Trilobites,[1] including Crepicephalus, Cedaria, Llanoaspidella,[3] and Blountia kindlei Resser, Coosella brevis Resser, Kingstonia ara (Walcott), K. kindlei Resser, and other Kingstonia species, Menomonia avitas (Walcott), Blountia, Modocia, Lonchocephalus, Genevievella, Pemphigaspis.[6]
- Brachiopods[3]
- Cryptozoon, a type of trace fossil[1][6]
- Stromatolites[5]
Notable Exposures
- Type section: Warrior Creek (formerly Warriorsmark Creek),Huntingdon County[1]
- Section near Waddle, Pennsylvania.[3]
Age
Relative age dating places the Warrior Formation in the middle to late Cambrian.
