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Earth Impact Database Sorted by : | Age | Diameter | Name |
Neugrund
Crater Name |
Location |
Latitude |
Longitude |
Diameter (km) |
Age (Ma)* |
Exposed |
Drilled |
Target Rock** |
Bolide Type*** |
Neugrund |
Estonia |
N 59° 20' |
E 23° 40' |
8 |
~ 470 |
N |
- |
S |
- |
References |
Suuroja, K., Suuroja, S., Neugrund Structure - the Newly Discovered Submarine Early Cambrian Impact Crater. (Gilmour I. and Koeberl C. eds) Impacts and the early Earth, Lecture notes in Earth Sciences, 91, pp. 389-416. 2000. |
Suuroja, K., Saadre, T., Gneiss breccia erratic boulders from northwestern Estonia as withnesses of an unknown impact structure (in Estonian). Bulletin of the Geological Survey of Estonia, v. 5/1, pp. 26-28. 1995. |
* 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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