manicouagan

Macha

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Macha  Russia  N 60° 6'  E 117° 35'  0.3  < 0.007  Y  N  S  Iron
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1. Aerial view of the Macha crater group from the north-west

2. Scheme of the Macha craters (from E.P. Gurov and E.P. Gurova, 1998) 1 – boundaries and inner walls of the craters;2 – relics of ejecta; 3 – alluvial fan of the creek; 4 – lakes in the craters

2. Aerial photograph of the Macha crater group (by E.P. Gurov)

References
Gurov, E. P., Gurova, E. P., The group of Macha crater in western Yakutia, Planetary Space Science, v.46, p.323-328. 1998.
Gurov, E. P., The group of Macha craters in western Yakutia (abstract). Lunar and Planetary Science, v. XXVII, pp. 473-474. 1996.
Gurov, E. P., Metallic particles from the Macha meteoritic crater and some placers in Yakutia (in Russian). Material and Origin of Meteorites (Collection of Scientific Works), pp. 80-85. 1988.
Gurov, E. P., Gurova, E.P. and Kovalyukh,N.N., The Macha meteorite-crater group, western Yakutia (in Russian). Doklady Akademii Nauk SSSR, v. 296, pp. 185-188. 1987.
Gurov, E. P., Gurova, E. P., Impact structures on the Earth's surface (in Russian). Geologicheskii Zhurnal, v. 47, pp. 117-124. 1987.
Gurov, E. P., Gurova, E. P., A group of young meteorite craters in the marginal northwestern part of the Aldan Anteclise (in Russian). Doklady Akademii Nauk Ukrainskoi SSR, Seriya "B", v. 2, pp. 9-12. 1984.
* 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)