Beaverhead
| Crater Name | Location | Latitude | Longitude | Diameter (km) | Age (Ma) | Exposed | Drilled | Target Rock** | Bolide Type*** |
|---|---|---|---|---|---|---|---|---|---|
| Beaverhead | Montana, U.S.A. | N 44° 36' | W 113° 0' | 60 | ~ 600 | Y | N | M | - |
Bouguer gravity map of region surrounding the proposed
thrust detached root to the Beaverhead structure, East Idaho.
References |
Carr, J., Link, P.K., Geslin, J.K., McCafferty, A., Hargraves,R.B., Sedimentary Breccia Deposited within Eocambrian Beaverhead Impact Crater, Lost River Range, Idaho, GSA Abstracts with Programs, 1996, Session 92. P. 230. 1996. |
Cockell, C. S., Lee, P., The Biology of Impact Craters - a review. Biol. Rev., 77, P. 279 - 310. 2002. |
Dietz, R. S., McHone, J. F., Astroblemes recently confirmed with shatter cones (abstract). Meteoritics, v. 26, p. 332. 1991. |
Fiske, P. S., The preservation of impact features in orogenic belts: The case of the Beaverhead structure, SW Montana (abstract). 1993 Fall Meeting, AGU, v. Fall, p. 387. 1993. |
Fiske, P. S., Hargraves, R.B., Onstott, T.C., Kkoeberl, C. and Hougen,S.B., Pseudotachylites of the Breaverhead impact structure: Geochemical, geochronological, petrographic, and field investigations. Geological Society of America Special Paper 293, pp. 163-176. 1994. |
Fiske, P. S., Hougen, S.B. and Hargraves,R.B., Breccia dikes from the Beaverhead impact structure, southwest Montana (abstract). International Conference on Large Meteorite Impacts and Planetary Evolution, LPI Contribution No. 790, pp. 26. 1992. |
Geissman J. W., Brearley A. J., Housen B. A., Fiske P. S., Hargraves R., The Beaverhead Impact Structure - Discovery and Investigation of an Allocthonous Impact Structure in SW Montana, 2003. |
Glikson, A. Y., Mega-impacts and mantle-melting episodes: tests of possible correlations. AGSO Journal of Australian Geology & Geophysics, v. 16, pp. 587-607. 1996. |
Hargraves, R. B., Christiansen, P P., Cullicott, C E., Deffeyes, K S., Fiske, P S. and Hougen,S., Shatter cones and shocked rocks in southwestern Montana: The Beaverhead impact structure. Geology, v. 18, pp. 832-834. 1990. |
Hargraves, R. B., White, J. C., Micro-Shock deformation adjacent to the surface of shatter cones from the Beaverhead Impact Structure, Montana, The Journal of Geology, v. 104, p. 233-238. 1996. |
Hargraves, R. B., Kellogg, K.S., Fiske, P.S. and Hougen,S.B., Allochthonous impact-shocked rocks and superimposed deformations at the Beaverhead site in southwest Montana. Geological Society of America Special Paper 293, pp. 225-235. 1994. |
Hargraves, R. B., Where's the Beaverhead beef? (abstract). International Conference on Large Meteorite Impacts and Planetary Evolution, LPI Contribution No. 790, pp. 35-36. 1992. |
Kellogg, K. S., Snee, L. W. , Unruh, D. M., The Mesoproterozoic Beaverhead Impact Structure and Its Tectonic Setting, Montana-Idaho: 40Ar/ 39Ar and U-Pb Isotopic Constraints. The Journal of Geology, Vol. 111, P. 639 - 652. 2003. |
Koeberl, C., Fiske, P. S., Beaverhead impact structure, Montana: Geochemistry of impactites and country rock samples (abstract). Meteoritics, v. 26, pp. 358-359. 1991. |
Lee, P., Kay, R. W., Search for a meteoritic component at the Beaverhead impact structure, Montana (abstract). International Conference on Large Meteorite Impacts and Planetary Evolution, LPI Contribution No. 790, pp. 47. 1992. |
McCafferty, A. E., Assessing the presence of a buried meteor impact crater using geophysical data, south-central Idaho (abstract). Thesis, Colorado School of Mines. 1995. |
McCafferty, A. E., Hargraves, R B., Roddy, D J. and Kellogg,K S., Does the root of the Beaverhead impact structure have a geophysical signature? (abstract). 1993 Fall Meeting, AGU, v. Fall, p. 223. 1993. |
Merrill J. C., The formation of Leaton Gulch, Grouse Peak, Pahsimeroi Mountains, Custer County, Idoho, Neoproterozoic conglomerates and breccias and their relation to the Beaverhead impact Structure, 2010. |
| * 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) |