Tools made by some of North America's earliest inhabitants were made only during a 300-year period

phys.org ^ | Oct 23, 2020 | Keith Randall

[rdl6989]

There is much debate surrounding the age of the Clovis—a prehistoric culture named for stone tools found near Clovis, New Mexico in the early 1930s—who once occupied North America during the end of the last Ice Age. New testing of bones and artifacts show that Clovis tools were made only during a brief, 300-year period from 13,050 to 12,750 years ago.

[I-ambush]

The paleo-progressives got voted in and enacted spear control.

[minnesota_bound]

Tools made by some of North America’s earliest inhabitants were made only during a 300-year period

This is because the Clovis politicians went offshore to the Chinese Clovis manufacturers.

[Rurudyne]

Eventually SUVs caused Martian warming in recent decades.

[SunkenCiv]

Thanks for the pings! And here's the book discussed above.

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The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization by Richard Firestone, Allen West, and Simon Warwick-Smith

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[SunkenCiv]

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join or quit view topics view or post blog bookmark post new topic subscribe

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[SunkenCiv]

[SunkenCiv]

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[SunkenCiv]

The rest of the Iron-60 keyword, chrono:

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• Supernova debris found on Earth [2004]
• Astronomy Picture of the Day 05-23-04 [2004]
• Theory Proposes New View of Sun and Earth's Creation [2004]
• Did a gamma-ray burst devastate life on Earth? [2003]
• How star blasts forged mankind [2002]
• Supernova "Smoking Gun" Linked To Mass Extinctions [2002]

[griffin]

Clovis society was doing great until Grog became Woke and changed his gender identity. It went downhill fast after that.

[PIF]

One gets the same effect with an oblique meteoric impacter made of iron hitting at high rate of speed. The impacter essentially drags a vacuum behind it at the same temperature as space causing the flash frozen effect, while the impact itself sends out high speed particles which gouge the tusks.

Just an alternate explanation not a challenge

[central_va]

Then they imported them from Asia.

[TXnMA]

In most places on Planet Earth, there is no supply of lithic material of sufficient quality and size -- available exposed on the surface -- to enable the (technically challenging) production of Clovis-technology projectile points.

Nomadic people -- passing through localized good resource areas -- would make the points and move on -- into resource-poor areas, where no new Clovis-technology points could be made.

This could appear as an apparent short lifetime for the technology.

TXnMA   
  

[amorphous]

IIRC, one of the theories is that larger impacters did create bubble vacuums which allowed lighter particles of cosmic origin to reach the surface.

The book listed above goes into great detail about what may have occurred.

[TXnMA]

I also note that the large, light colored artifact in the photo is not a completed Clovis point. It is, instead a preform -- a work-in-progress -- that failed during manufacture -- probably due to insufficient support/immobilization during attempted formation of a "flute".

What is shown is evidence of the most common cause of failure of attempts at making long, clovis-morphology points: "End Shock".

Knappable materials are lousy at flexing; rather than bend, they will SNAP! When the end being fluted was driven downward by the impaact of the soft hammer (antler butt), the center flexed upward. Because the center was inadequately restrained by wrapped leather and hand pressure, the stone exceeded its elastic limit and fractured in tension.

Modern lithicists call the failure mode, "end shock". No doubt, prehistoric flintknappers -- who needed the point for survival -- had much more colorful expressions for the event!! '-)

TXnMA   
  

[SunkenCiv]

Thanks TXnMA, both great comments.

[rdl6989]

Thanks, great info!!