Obolon' crater is a 20 km (12 mi) diameter buried meteorite impact crater situated about 200 km (120 mi) southeast of Kiev in Ukraine (Poltava Oblast).^[2] The site has been drilled, which revealed the presence of shocked minerals and impact melt rock; the high chlorine content of the latter suggesting that the area was covered by shallow sea at the time of impact.^[3] One estimate puts the age at 169 ± 7 million years (Middle Jurassic).^[4]

• http://en.wikipedia.org/wiki/Obolon' crater