Skip Navigation Links
Home
 - Rare minerals
 - Fulgurites
 - Shock-metamorphosed rocksExpand  - Shock-metamorphosed rocks
 - ImpactitesExpand  - Impactites
 - Tektites
Astroblemes
Policies
Contact
Meteorites:
Systemaic minerals:
Visitors online: 46
Homepage visits: 12333
Name:Kara
Country:Russia
Location: 
Diameter:65 km
Age:70 million
Coordinates:69°6' N 64°9' E
Link to Google Maps: here
KML file for Google Earth: here
Associated specimens:
Polymict breccia
Structure gris by limestone
Tagamite
Vitroclastic polymineral glass
Vitroclastic suevite
Vitro-lithoclastic suevite

Source: http://www.gsajournals.org/

Ample evidence exists for at least one major meteorite impact event at the time of the Cretaceous/Tertiary (K/T) boundary, and it is therefore important to establish if any recognized terrestrial impact craters are K/T in age. The Kara, USSR, impact structure consists of two adjacent large impact craters (a rare and interesting geologic phenomenon), and it has been suggested that this twin impact structure might be related to the K/T boundary event. However, newly determined 40Ar/39Ar and K-Ar ages presented here suggest that these structures are slightly older than 70 Ma, and may thus be too old for a 66 Ma K/T boundary event. Still, these two craters represent a substantial impact event that could have initiated regional, if not global, degradation of the biosphere. Their age suggests a possible relation with the Campanian/Maastrichtian boundary.