The Holston Formation, alternately known as the Holston Limestone, is a

stratigraphic Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithost ...

unit of

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ...

age within the Chickamauga Group in the Ridge-and-Valley physiographic province of the southeastern

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. A long

outcrop An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth and other terrestrial planets. Features Outcrops do not cover the majority of the Earth's land surface because in most p ...

belt of the Holston in

East Tennessee East Tennessee is one of the three Grand Divisions of Tennessee defined in state law. Geographically and socioculturally distinct, it comprises approximately the eastern third of the U.S. state of Tennessee. East Tennessee consists of 33 coun ...

is the source of the decorative building stone known as Tennessee marble. Near

Knoxville Knoxville is a city in Knox County, Tennessee, United States, and its county seat. It is located on the Tennessee River and had a population of 190,740 at the 2020 United States census. It is the largest city in the East Tennessee Grand Division ...

the Holston Formation is about thick but it thins toward the southwest; near

Cleveland, Tennessee Cleveland is the county seat of, and largest city in, Bradley County, Tennessee. The population was 47,356 at the 2020 United States census, 2020 census. It is the principal city of the Cleveland metropolitan area, Tennessee (consisting of Bradle ...

it is only 200 feet thick. The rock that is quarried for marble is a highly pure (97% CaCO₃)

crystalline A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macrosc ...

limestone Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of the material Lime (material), lime. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science) ...

, pink to cedar-red in color.

Use in building and sculpture

Among the notable buildings where Tennessee marble is used as a building stone are two in

Washington, D.C. Washington, D.C., formally the District of Columbia and commonly known as Washington or D.C., is the capital city and federal district of the United States. The city is on the Potomac River, across from Virginia, and shares land borders with ...

: the

National Gallery of Art The National Gallery of Art is an art museum in Washington, D.C., United States, located on the National Mall, between 3rd and 9th Streets, at Constitution Avenue NW. Open to the public and free of charge, the museum was privately established in ...

, which uses stone from Knox and Blount counties, and the

United States Capitol The United States Capitol, often called the Capitol or the Capitol Building, is the Seat of government, seat of the United States Congress, the United States Congress, legislative branch of the Federal government of the United States, federal g ...

, which has stairways constructed from Hawkins County marble.
Descriptions and Origins of Selected Principal Building Stones of Washington
', U.S. Geological Survey, revised 1-14-99, accessed December 23, 2007.

References

General

Mineral Commodities
in ''Mineral Resources of the Appalachian Region'', U.S. Geological Survey and U.S. Bureau of Mines, Geological Survey Professional Paper 580, 1968.

Notes

External links

Knoxville's marble past
'' Knoxville News Sentinel'', August 26, 2008 (article and videos) Ordovician Tennessee Ordovician southern paleotemperate deposits {{US-geologic-formation-stub