The

Cambrian The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million ...

Warrior Formation is a mapped

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...

bedrock In geology, bedrock is solid Rock (geology), rock that lies under loose material (regolith) within the crust (geology), crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface mater ...

unit in

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

Description

The Warrior Formation is described by Berg and others as gray, thin- to medium-bedded, fossiliferous, cyclic limestone bearing

stromatolite Stromatolites () or stromatoliths () are layered sedimentary formations (microbialite) that are created mainly by photosynthetic microorganisms such as cyanobacteria, sulfate-reducing bacteria, and Pseudomonadota (formerly proteobacteria). The ...

s, interbedded with shale, siltstone, and sandstone.Berg, T.M. (compiler), 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey State Map, 4th series, 1, 1 sheet, scale 1:250,00

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Fossils

Trilobites Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...

, including ''

Crepicephalus ''Crepicephalus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period The Cambrian Period ( ; som ...

'', ''

Cedaria ''Cedaria'' is a small, rather flat trilobite with an oval outline, a headshield and tailshield of approximately the same size, 7 articulating segments in the middle part of the body and spines at the back edges of the headshield that reach halfl ...

'', '' Llanoaspidella'', 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''.Charles Butts, 1945
Hollidaysburg-Huntingdon folio
Pennsylvania, Folios of the Geologic Atlas 227. United States Geological Survey. *

Brachiopods Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, whi ...

* ''Cryptozoon'', a type of trace fossil *

Stromatolites Stromatolites () or stromatoliths () are layered sedimentary formations (microbialite) that are created mainly by photosynthetic microorganisms such as cyanobacteria, sulfate-reducing bacteria, and Pseudomonadota (formerly proteobacteria). The ...

Notable Exposures

* Type section: Warrior Run, 1 mile east of

Williamsburg Williamsburg may refer to: Places *Colonial Williamsburg, a living-history museum and private foundation in Virginia *Williamsburg, Brooklyn, neighborhood in New York City *Williamsburg, former name of Kernville (former town), California *Williams ...

Blair County Blair County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 122,822. Its county seat is Hollidaysburg. The county was created on February 26, 1846, from parts of Huntingdon and Bedford counties. Blai ...

* Warrior Creek (formerly Warriorsmark Creek), east of Warriors Mark,

Huntingdon County Huntingdon is a market town in the Huntingdonshire district in Cambridgeshire, England. The town was given its town charter by John, King of England, King John in 1205. It was the county town of the historic county of Huntingdonshire. Oliver Cr ...

* Section near

Waddle, Pennsylvania Waddle is a populated place in Patton Township, Centre County, Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Gr ...

.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 195
abstract
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Age

Relative age dating places the Warrior Formation in the middle to late

References

Cambrian geology of Pennsylvania Limestone Cambrian southern paleotemperate deposits {{Pennsylvania-geologic-formation-stub