The Glasford crater is a buried impact crater in southern Peoria County,

Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...

, in the United States. It is in diameter and the age is estimated to be less than 430 million years (

Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozo ...

or younger). The Glasford crater was discovered by drilling wells for underground

natural gas Natural gas (also called fossil gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Low levels of trace gases like carbo ...

storage.Meteorite Research - Progress Report
, Research Subcommittee, Associate Committee on Meteorites,

National Research Council of Canada The National Research Council Canada (NRC; french: Conseil national de recherches Canada) is the primary national agency of the Government of Canada dedicated to science and technology research & development. It is the largest federal research ...

, 1967

References

Impact craters of the United States Geology of Illinois Silurian impact craters Silurian Illinois .craters Landforms of Peoria County, Illinois Landforms of Illinois {{PeoriaCountyIL-geo-stub