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Earth Impact Database Sorted by : | Name | Diameter | Age |



Crater Name
Diameter (km)
Age (Ma)*
Target Rock**
Bolide Type***
N 59° 20'
E 23° 40'
~ 535


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.
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, S., Surroja, K., and Floden, T. Features of the dislocation zone of complex impact structures; marine impact structures Neugrund and Kardla (Baltic Sea, Estonia). Opas - Geologian Tutkimuskeskus, vol.57, pp.82. 2012.
Suuroja, S., Suuroja, K., and Flodén, T. A comparative analysis of two Early Palaeozoic marine impact structures in Estonia, Baltic Sea: Neugrund and Kärdla. Bulletin of the Geological Society of Finland, 85, 83–101. 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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