I've seen you post before on this. The whole catastrophist label seems overly broad, and some parts are reasonable while other parts are less so. How advanced

I've seen you post before on this. The whole catastrophist label seems overly broad, and some parts are reasonable while other parts are less so. How advanced do you think this civilization was? Do you think it was the Clovis people? I think the megafauna extinction as support for a catastrophic event is very poor. You see multiple waves of megafauna extinctions, each preceded by human introduction. Places without human presence had megafauna into the late 20th century. I'm not saying it didn't happen, but I'm saying it's unconvincing. And air bursts of that magnitude and coverage don't square with fossil or sediments. But ... impacts aren't required for this. Maybe there was a culture that was relatively advanced. The Mississippian structures were huge. Incan and Mayan cultures were advanced based on contemporary cultures. Anyway, I'm curious what you believe is the case.