[SunkenCiv]

Thanks Axenolith and NormsRevenge.

Barringer Crater, better known as Meteor Crater, could have formed in human times in North America. Clearly the terrain for a long way around is worse for wear due to the impact itself, a fact that mitigates in favor of it being more recent than the largely speculative 50,000 year figure often seen. Estimates of its mass and velocity are quite wide.

http://www.barringercrater.com/about/
https://solarsystem.nasa.gov/multimedia/display.cfm?IM_ID=789
http://en.wikipedia.org/wiki/Meteor_Crater
[snip] Because the United States Board on Geographic Names commonly recognizes names of natural features derived from the nearest post office, the feature acquired the name of “Meteor Crater” from the nearby post office named Meteor. [/snip]

[Paladin2]

Sounds do loopy recursive.

[Axenolith]

I don’t buy that it’s younger, I buy that people have been here a LOT longer than the academic crew wants to admit.

Kind of an anthropological version of Alfred Wegeners travails with continental drift.