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


Santa Marta

Crater Name
Diameter (km)
Age (Ma)*
Target Rock**
Bolide Type***
Santa Marta
S 10°10'
W 45° 15'


De Oliveira, G. J. G., Vasconcelos, M. A. R., Crósta, A. P., Reimold, W. U., Góes, A. M., and Kowitz, A. 2014. Shatter cones and planar deformation features confirm Santa Marta in Piauí State, Brazil, as an impact structure. Meteoritics & Planetary Science, 49(10), 1915–1928. doi:10.1111/maps.12368
Vasconcelos, M.A.R., Crosta, A.P., and Molina, E.C. Geophysical characteristics of four possible impact structures in the Parnaiba Basin, Brazil; comparison and implications. Special Paper - Geological Society of America, vol. 465, pp.201. 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)



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