Kasota limestone or simply, 'Kasota stone,' is a dolomitic limestone

Dolostone

Dolostone or dolomite rock is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite. In old U.S.G.S. publications it was referred to as magnesian limestone. Most dolostone formed as a magnesium replacement of limestone or lime mud prior to lithification. It is...

 found in southern Minnesota

Minnesota

Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...

. This sedimentary rock

Sedimentary rock

Sedimentary rock are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles to settle and accumulate or minerals to precipitate from a solution....

 is part of the Oneota

Oneota

Oneota is a designation archaeologists use to refer to a cultural complex that existed in the eastern plains and Great Lakes area of what is now the United States from around AD 900 to around 1650 or 1700. The culture is believed to have transitioned into various Macro-Siouan cultures of the...

 Dolostone Formation of southern Minnesota and is approximately 450 million years old (lower Ordovician

Ordovician

The Ordovician is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago . It follows the Cambrian Period and is followed by the Silurian Period...

 Period). This particular limestone is rich in dolomite and magnesium

Magnesium

Magnesium is a chemical element with the symbol Mg, atomic number 12, and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole...

, making it resistant to weathering, and it is thus widely used as a building material.

Kasota stone features prominently in the facade of Target Field

Target Field

Target Field is a baseball park located in downtown Minneapolis, Minnesota. It is the home ballpark of the Minnesota Twins, the city's Major League Baseball franchise. It is the franchise's sixth ballpark and third in Minnesota. The Twins moved to Target Field for the 2010 Major League Baseball...

, the home of the Major League Baseball Minnesota Twins

Minnesota Twins

The Minnesota Twins are a professional baseball team based in Minneapolis, Minnesota. They play in the Central Division of Major League Baseball's American League. The team is named after the Twin Cities area of Minneapolis and St. Paul. They played in Metropolitan Stadium from 1961 to 1981 and the...

 in Minneapolis, Minnesota.

Gustavus Adolphus College

Gustavus Adolphus College

Gustavus Adolphus College is a private liberal arts college affiliated with the Evangelical Lutheran Church in America located in St. Peter, Minnesota, United States. A coeducational, four-year, residential institution, it was founded in 1862 by Swedish Americans. To this day the school is firmly...

's original "Old Main" building (St. Peter, MN, USA) was constructed of Kasota stone and completed in 1876.