The Cambrian Warrior Formation is a mapped limestone bedrock unit in Pennsylvania.
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 Run, 1 mile east of Williamsburg, Blair County
- Warrior Creek (formerly Warriorsmark Creek), east of Warriors Mark, Huntingdon County
- Section near Waddle, Pennsylvania.[3]
Age
Relative age dating places the Warrior Formation in the middle to late Cambrian.
References
- ^ a b c d Butts, Charles, 1918, Geologic section of Blair and Huntingdon Counties, central Pennsylvania: American Journal of Science, 4th series, v. 46, p. 523-537.
- ^ Wilson, J.L., 1952, Upper Cambrian stratigraphy in the central Appalachians: Geological Society of America Bulletin, v. 63, no. 3, p. 275-322.
- ^ a b c d Tasch, Paul, 1951, Fauna and Paleoecology of the Upper Cambrian Warrior Formation of Central Pennsylvania, Journal of Paleontology, Vol. 25, No. 3, pp. 275-306, pls. 44-47, May 1951 abstract
- ^ USGS Mineral Resources On-Line Spatial Data, retrieved 4 Mar. 2011
- ^ a b Berg, T.M. (compiler), 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey State Map, 4th series, 1, 1 sheet, scale 1:250,000 [1]
- ^ a b Charles Butts, 1945. Hollidaysburg-Huntingdon folio, Pennsylvania, Folios of the Geologic Atlas 227. United States Geological Survey.