220,000 year ago, 40 miles north of Petoria, 100 time the power of the Hiroshima blast. 1 Kilometer crater. Tswaing Crater.
50,000 years ago Berringer Crater AZ, near the same size.
22,000 year ago, Mauritania West Africa, about the same.
As the Earth is 4/5 water, 4 out of five hit the ocean.
A major hit every 5,000 years seems about right.
This one from 13,000 years ago seems about right, the Lesser Dryas was a 1,500 year dust storm.
The surface of the time has a lot of Platenates, not of local origen.
Some come in so slow they are still deep cold when reaching the ground, and barely make a dent.
Others are a bit faster, leave streaks in the sky, have a burned crust, but are still found on the surface. long angle, lots of air breaking.
Some come straight down, and blow a Kilometer hole.
Some are Cosmic, coming in at 40,000 miles per second, are torn apart by their own pressure wave, like Tunguska, and become a blast wave that starts fires. Tunguska left Yittrium pellets and dust. A rare earth, and a lot of it. Not known concentrated in nature, so some think a ship, it did change course coming in.
Some are crust, some are mantel, nickel iron, and some are core, platenates.
Chunks of core are dense, solid, moving fast, and seem to cause the most damage.
The layer Clovis is found in is gray sand, from organic material, it was long the surface.
Then it was covered by a layer of yellow sand, then red sand, the Lesser Dryas left red sand up to fifty foot deep over most of the western US. There are no intermediate surfaces, it was one long 1,500 year sand storm.
When it was over there were no large mammals, and there are no people continuing the Clovis traits.
Farther east it deposited the Losse soils, seen at Vicksburg MS, 50 to 100 deep, fine powder, wind deposits. Western China got the same, it was world wide.
It was cold, dry, windy, dusty, and right after that the Sahara formed from lakes, grassland, with trees, to desert, reaching Arabia, Iraq.
It was a larger climate change than the ice ages.