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Des Plaines crater
The Des Plaines crater or Des Plaines disturbance is recognized as an impact crater in Cook County, Illinois, United States. It is located beneath the eastern part of the city of Des Plaines, which is a suburb of Chicago.
It is in diameter and covers an area of approximately .〔 The age is estimated to be less than 280 million years (Permian or younger). The crater is buried beneath 75 to 200 feet (23–60 m) of glacial till and can only be seen as a series of faults and deformations in well logs and seismic surveys. Faulting in the structure has produced as much as of vertical displacement.〔 Subsurface strata of Cambrian through Pennsylvanian age has been faulted and tilted by the event.〔 The anomalous area was first noted by water well drillers in 1893, who noted an absence of water in a deep well. Prior to being recognized as an impact structure, the feature was referred to as a ''cryptoexplosion structure'' or ''cryptovolcanic structure'', as were several others in the Midwestern United States.〔 The upfaulted central portion〔 and the presence of shatter cone structures support the impact origin.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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