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Earth Impact Database Sorted by : | Age | Diameter | Name |
Rock Elm
Crater Name |
Location |
Latitude |
Longitude |
Diameter (km) |
Age (Ma)* |
Exposed |
Drilled |
Target Rock** |
Bolide Type*** |
Rock Elm |
Wisconsin, U.S.A. |
N 44° 43' |
W 92° 14' |
6 |
< 505 |
- |
- |
S |
- |
References |
Cavosie, A.J., Roig, C.I., McDougal, D.J., Ushikubo, T., Spicuzza, M.J., Fournelle, J., Valley, J.W., Cordua, W.S., Mattson, C., The Sedimentary Record of a Small, Deeply Eroded Impact Structure: A Search for Detrital Shocked Minerals and Extraterrestrial Chromites in Sediments Eroded from the Ordovician Rock Elm Impact Structure (USA), 44th Annual Lunar and Planetary Science Conference, abstract #2028. 2013. |
Cordua, W. S., "The Rock Elm Disturbance, Pierce County, Wisconsin", in Balaban, Nancy, edited, Minnesota Geological Survey Guidebook Series #15, p. 123-152. 1987. |
Cordua, W. S., "The Rock Elm Structure, Pierce County, Wisconsin, a possible cryptoexplosion structure", Geology, vol. 13, p. 372-374. 1985. |
French, B. M., Cordua, W. S., Intense fracturing of quartz at the Rock Elm (Wisconsin) "cryptoexplosion" structure: evidence for meteorite impact, 30th Annual Lunar and Planetary Science Conference, abstract #1123. 1999. |
Roig, C.I., Cavosie, A.J., McDougal, D., Cordua, W.S., Mattson, C., Detrital shocked quartz in modern sediments eroded from the Rock Elm impact structure, Wisconsin, USA, 44th Annual Lunar and Planetary Science Conference, abstract #2685. 2013. |
* pre-1977 K-Ar, Ar-Ar and Rb-Sr ages recalculated using the decay constants of Steiger and Jager (1977) Ages in millions of years (Ma) before present.
** Abbreviations: C - Crystalline Target; C-Ms - Metasedimentary Target; M - Mixed Target (i.e.sedimentary strata overlying crystalline basement); S - sedimentary target (i.e. no crystalline rocks affected by the impact event). From Osinski. G. R., Spray J. G., and Grieve R. A. F. 2007. Impact melting in sedimentary target rocks: A synthesis. In The Sedimentary Record of Meteorite Impacts, Geological Society of America Special Paper. Editors: Evans K. Horton W., King D., Morrow J., and Warme J. Geological Society of America: Boulder, in press.
*** From Koeberl,C. Identification of meteoritic components in impactites. 1998, Koeberl, C. The Geochemistry and Cosmochemistry of Impacts. 2007 and PASSC Files. (IAB, IIIAB, IIIB, IIID - Iron Meteorite) |
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