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.[1][2]
The Des Plaines crater is 5.5 miles (8.9 km) in diameter and covers an area of approximately 25 square miles (65 km2).[3] The age of the crater is unknown but is thought to be between 280 million years and 2 million years (Permian or younger).[4] 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.[3] Faulting in the structure has produced as much as 600 feet (180 m) of vertical displacement.[3] Subsurface strata of Cambrian through Pennsylvanian age has been faulted and tilted by the event.[1][5] The anomalous area was first noted by water well drillers in 1893, who noted an absence of water in a 1,600-foot (490 m) 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.[5] The upfaulted central portion[5] and the presence of shatter cone structures support the impact origin.[1]
References
^ abcWiggers, Ray (1997). Geology Underfoot in Illinois. Missoula, Mont: Mountain Press Pub. Co. pp. 74, 82–83. ISBN978-0-87842-346-0.
^ abc. Prairie Research Institute. 23 October 2009. Archived from the original on 7 April 2014. Retrieved 21 November 2014.
^Bentle, Kyle (February 7, 2017). "When a Meteor Hit: Millions of Years Ago in Des Plaines". Chicago Tribune. Retrieved January 5, 2018. When did it happen? Scientists don't know, exactly, but you can narrow it down to a 300-million year timeframe, Monson said. The oldest the impact could be dates back to the Pennsylvanian Period in the geologic time scale, 299 million to 323 millions years ago. The youngest it could be is about 2 million years, when advancing glaciers covered the crater.
^ abcEmrich, Grover H.; Bergstrom, Robert E. (12 July 1960). "Des Plaines Disturbance, Northeastern Illinois". GSA Bulletin. 73 (8): 959–968. doi:10.1130/0016-7606(1962)73[959:DPDNI]2.0.CO;2. Retrieved 21 November 2014.
External links
Aerial Exploration of the Des Plaines Impact Structure
plaines, crater, plaines, disturbance, recognized, impact, crater, cook, county, illinois, united, states, located, beneath, eastern, part, city, plaines, which, suburb, chicago, information, about, plaines, disturbance, included, this, trail, marker, cook, co. 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 1 2 Information about the Des Plaines Disturbance is included in this trail marker in the Cook County Forest Preserve The sign is near Big Bend Lake along the Des Plaines River Trail The Des Plaines crater is 5 5 miles 8 9 km in diameter and covers an area of approximately 25 square miles 65 km2 3 The age of the crater is unknown but is thought to be between 280 million years and 2 million years Permian or younger 4 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 3 Faulting in the structure has produced as much as 600 feet 180 m of vertical displacement 3 Subsurface strata of Cambrian through Pennsylvanian age has been faulted and tilted by the event 1 5 The anomalous area was first noted by water well drillers in 1893 who noted an absence of water in a 1 600 foot 490 m 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 5 The upfaulted central portion 5 and the presence of shatter cone structures support the impact origin 1 References Edit a b c Wiggers Ray 1997 Geology Underfoot in Illinois Missoula Mont Mountain Press Pub Co pp 74 82 83 ISBN 978 0 87842 346 0 Des Plaines Earth Impact Database University of New Brunswick Archived from the original on 29 November 2014 Retrieved 21 November 2014 a b c Faulting and the Des Plaines Disturbance Prairie Research Institute 23 October 2009 Archived from the original on 7 April 2014 Retrieved 21 November 2014 Bentle Kyle February 7 2017 When a Meteor Hit Millions of Years Ago in Des Plaines Chicago Tribune Retrieved January 5 2018 When did it happen Scientists don t know exactly but you can narrow it down to a 300 million year timeframe Monson said The oldest the impact could be dates back to the Pennsylvanian Period in the geologic time scale 299 million to 323 millions years ago The youngest it could be is about 2 million years when advancing glaciers covered the crater a b c Emrich Grover H Bergstrom Robert E 12 July 1960 Des Plaines Disturbance Northeastern Illinois GSA Bulletin 73 8 959 968 doi 10 1130 0016 7606 1962 73 959 DPDNI 2 0 CO 2 Retrieved 21 November 2014 External links EditAerial Exploration of the Des Plaines Impact Structure Coordinates 42 3 N 87 52 W 42 050 N 87 867 W 42 050 87 867 This Cook County Illinois location article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Des Plaines crater amp oldid 990746520, wikipedia, wiki, book, books, library,
