I’m sure they have an equally absurd explanation for the near worldwide distribution of Black Mat, and the Carolina Bays whose rays trace back to a location around Hudson Bay. Same for the Nebraska Rainwater Basin.
Graham Hancock also goes over this material and references in “America Before” and “The Magicians”.
Its easy to find “no evidence” when they do not look at or plain dismiss all the existing evidence.
Gradualists defending Gradualism - no feathers ruffled, everyone can be safely tucked in at night with no worries because catastrophes of such magnitude are patently impossible ... until one happens.
What about the lake Missoula ice dam break that flooded eastern Washington and the Columbia Basin
https://www.iafi.org/ice-age-floods-videos/?playlist=f856840&video=fa7189c