Manicouagan crater
Laser argon-argon dating of the glass formed by the impacts, and stratigraphic evidence, support an age of 215 ± 25 mya. The impact places have moved far apart in the intervening 214 million years. Three of the craters—Rochechouart, Manicouagan and Saint Martin—formed a  chain at latitude 22.8° N, while Obolon' and Red Wing lay on identical declination paths with Rochechouart and Saint Martin respectively. All of the craters had previously been known and studied, but their paleoalignment had never before been demonstrated. The chance that these craters could be aligned like this accidentally are nearly zero.