The Boltysh crater or Bovtyshka crater is a buried impact crater in the Kirovohrad Oblast of Ukraine, near the village of Bovtyshka. The crater is in diameter and its age of 65.39 ± 0.14/0.16 million years, based on argon-argon dating techniques, less than 1 million years younger than Chicxulub crater in Mexico and the Cretaceous–Paleogene boundary (K–Pg boundary). The Chicxulub impact is believed to have caused the mass extinction at the end of the Cretaceous period, which included the extinction of the non-avian dinosaurs. The Boltysh crater is currently thought to be unrelated to the Chicxulub impact, and to have not generated major global environmental effects. Overview Boltysh crater is located in central Ukraine, in the basin of the Tiasmyn River, a tributary of the Dnieper River. It is in diameter, and is surrounded by an ejecta blanket of breccia preserved over an area of . It is estimated that immediately after the impact, ejecta covered an area of to a depth of or greater, and was some deep at the crater rim. The crater contains a central uplift about in diameter, rising about above the base level of the crater. This uplift currently lies beneath about of sediment deposited since the impact, and was discovered in the 1960s during oil shale deposits exploration. Age The Boltysh depression was identified as a fossil meteorite crater by 1975. By 1987, it was dated to 100 ± 12 million years old. Early age estimates could only be roughly constrained between the age of the impacted rocks (the target) and the age of overlying sediments. The target rocks date from the Cenomanian (98.9 to 93.5 million years ago) and Turonian (93.5 to 89 million years ago) epochs. Bore samples of sediments overlying the crater contain fossils dating from the Paleocene epoch, 66 to 54.8 million years ago. The age of the crater was thus constrained to between 54 and 98 million years. Subsequent radiometric dating reduced the uncertainty. The concentration of decay products in impact glasses from the crater were used to derive an age of 65.04 ± 1.10 million years. A 2002 analysis of argon radioactive decay products yielded an age of 65.17 ± 0.64 million years. While these radiometric dating measurements place the Boltysh crater hundreds of thousands of years after the Chicxulub crater, a 2010 radiometric and palynological study of fern spore (fern spikes) abundance suggested the Boltysh impact may