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Ritland

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Ritland  Norway  N 59° 14'  E 6° 26'  2.7  520 ± 20  Y  N  C  -

View of the Ritland impact structure looking towards the south. Dashed line indicate approximate extent of the structure (Photo provided by Knut Vindfallet).

References
Azad, A. S., Tomczyk, M., Dypvik, H., Kalleson, E. and Riis, F. 2011. Syn-impact and early-post impact sedimentation in the Ritland impact structure, Western Norway. Geological Society of Norway, Winter Meeting, Stavanger, Norway (abstract).
Beyer, C. 2011. Palaeomagnetic investigation of the Ritland structure. Geological Society of Norway, Winter Meeting, Stavanger, Norway (abstract).
Kalleson, E., Dypvik, H. and Riis, F. 2010. The Ritland impact structure, Western Norway. 41th Lunar and Planetary Science Conference, Houston, Texas. (abstract #1326).
Kalleson, E., Riis, F., Setså, R., Azad, A. and Dypvik, H. 2011. The Ritland impact structure – shock deformation in minerals and outcrops. Geological Society of Norway, Winter Meeting, Stavanger, Norway (abstract).
Riis, F., Kalleson, E., Dypvik, H., Krøgli, S.-O. and Nilsen, O. 2011. The Ritland impact structure, southwestern Norway. Meteoritics and Planetary Science, v. 46, pp. 748-761.
Riis, F., Kalleson, E., Setså, R., Azad, A. and Dypvik, H. 2011.The Ritland impact structure – new evidence on age, environment and mechanisms of impact. Geological Society of Norway, Winter Meeting, Stavanger, Norway (abstract).
* 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)