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[dinosaur] Manson crater and the Campanian extinction



Good day,

I would like to ask if anyone has already evaluate the (literal) impact of the Manson crater impact on the late Campanian Appalachian and Laramidian biota? Given its age (about 73.8 mya) there was very rich dinosaur fauna at least on the Laramidia. It was estimated that this impact was capable of killing any surface-dwelling animal up to about 1050 km from its epicentre.

Did anyone looked for the evidence of some extinction patterns in the sediments of the same age in e. g. Montana and South Dakota, which were relatively near areas? Was this regional catastrophic event cabable of making some significant changes in the course of evolution of Laramidean dinosaur populations? Thank you in advance, Tom