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Dating impact craters: palaeogeographic versus isotopic and stratigraphic methods – a brief case study

Institut für Planetologie, Universität Stuttgart, Herdweg 51, D-70174 Stuttgart, Germany

^* Author for correspondence: martin.schmieder{at}geologie.uni-stuttgart.de

Isotopic and stratigraphic ages of the ~ 80 km diameter Puchezh-Katunki (Russia; 220 ± 10 to 167 ± 3 Ma) and the ~ 20 km diameter Obolon (Ukraine; 215 ± 25 to 169 ± 7 Ma) impact structures are associated with significant age uncertainties. As a case study, reconstructions of the palaeogeography at the time of crater formation (Late Triassic to Middle Jurassic) based on recent palaeogeographic maps help further to constrain impact ages. Palaeogeographic studies suggest that Puchezh-Katunki is older than 170 Ma and that Obolon is younger than 185 Ma. This also rules out that Obolon formed during a ~ 214 Ma Late Triassic multiple impact event as recently discussed.

Key Words: impact structure • dating • palaeogeography • marine impact