What you're are requiring of me is like me asking you for evidence of an astroid wiping out the dinos 60 or so million years ago, factoring in a ww flood, i.e. providing evidence that fits my creationist science world view.
In seven years around here you have yet to start on just the worldwide flood portion of that, Buz. Your non-existant "corroboration" is all you ever trot out.
For Chixulub, we have a crater, shocked quartz in Nebraska, tectites, iridium, tsunami deposits....
"The wretched world lies now under the tyranny of foolishness; things are believed by Christians of such absurdity as no one ever could aforetime induce the heathen to believe." - Agobard of Lyons,
ca. 830 AD