The Powell Formation or Powell Dolomite is a
geologic formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...
in northern
Arkansas
Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage ...
, southeast
Missouri
Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
and
Virginia
Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth ar ...
. It contains
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
,
cephalopod
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...
, and
trilobite
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 ...
fossils
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...
dating back to the
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...
Period
Period may refer to:
Common uses
* Era, a length or span of time
* Full stop (or period), a punctuation mark
Arts, entertainment, and media
* Period (music), a concept in musical composition
* Periodic sentence (or rhetorical period), a concept ...
.
[
]
See also
* List of fossiliferous stratigraphic units in Arkansas
This article contains a list of fossil-bearing stratigraphic units in the state of Arkansas, U.S.
Sites
See also
* Paleontology in Arkansas
References
*
{{DEFAULTSORT:Fossiliferous stratigraphic units in Arkansas
Arkansas
Stratigraph ...
* List of fossiliferous stratigraphic units in Missouri
This article contains a list of fossil-bearing stratigraphic units in the state of Missouri, U.S.
Sites
See also
* Paleontology in Missouri
References
*
{{DEFAULTSORT:Fossiliferous stratigraphic units in Missouri
Missouri
Stratigraphi ...
* List of fossiliferous stratigraphic units in Virginia
This article contains a list of fossil-bearing stratigraphic units in the state of Virginia, U.S.
Sites
See also
* Paleontology in Virginia
References
*
{{DEFAULTSORT:Fossiliferous stratigraphic units in Virginia
Virginia
Stratigraph ...
References
*
Ordovician Arkansas
Ordovician Missouri
Ordovician geology of Virginia
Ordovician geology of Tennessee
Ordovician southern paleotemperate deposits
Ordovician southern paleotropical deposits
{{US-geologic-formation-stub