Riachão Ring

Riachão Ring is a meteorite crater (astrobleme) in Brazil.

It is 4.5 km in diameter and the age is estimated to be less than 200 million years (Jurassic or younger). The crater is exposed at the surface. [cite web | title=Riachao Ring | work=Earth Impact Database | url=http://www.unb.ca/passc/ImpactDatabase/images/riachao-ring.htm | accessdate=2007-10-22 ]

References