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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
Posted on 10/23/2020 4:36:11 PM PDT by rdl6989
click here to read article
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To: rdl6989
The paleo-progressives got voted in and enacted spear control.
21
posted on
10/23/2020 6:18:06 PM PDT
by
I-ambush
(Got arrested for inciting a peaceful riot)
To: rdl6989
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.
22
posted on
10/23/2020 6:19:12 PM PDT
by
minnesota_bound
(homeless guy. He just has more money....He the master will plant more cotton for the democrat party)
To: taterjay
Eventually SUVs caused Martian warming in recent decades.
23
posted on
10/23/2020 6:50:10 PM PDT
by
Rurudyne
(Standup Philosopher)
To: rdl6989; Robert A Cook PE; Rurudyne; zek157; amorphous; UnbelievingScumOnTheOtherSide; ...
Thanks for the pings! And here's the book discussed above.
24
posted on
10/23/2020 10:36:38 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
To: 75thOVI; Abathar; agrace; aimhigh; Alice in Wonderland; AnalogReigns; AndrewC; aragorn; ...
25
posted on
10/23/2020 10:41:18 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
To: StayAt HomeMother; Ernest_at_the_Beach; 1ofmanyfree; 21twelve; 24Karet; 2ndDivisionVet; 31R1O; ...
26
posted on
10/23/2020 10:41:23 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
To: 240B; 75thOVI; Adder; albertp; asgardshill; At the Window; bitt; blu; BradyLS; cajungirl; ...
Here are the other GGG topics introduced since the previous Digest ping:
27
posted on
10/23/2020 10:48:26 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
The rest of the Iron-60 keyword, chrono:
28
posted on
10/23/2020 10:52:02 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
To: rdl6989
Clovis society was doing great until Grog became Woke and changed his gender identity. It went downhill fast after that.
29
posted on
10/23/2020 11:01:12 PM PDT
by
griffin
To: amorphous
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
30
posted on
10/24/2020 4:52:31 AM PDT
by
PIF
(They came for me and mine ... now its your turn)
To: rdl6989
Then they imported them from Asia.
31
posted on
10/24/2020 4:53:11 AM PDT
by
central_va
(I won't be reconstructed and I do not give a damn...)
To: rdl6989; SunkenCiv
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
32
posted on
10/24/2020 10:46:27 AM PDT
by
TXnMA
(The Democrat Party has a single-plank platform: HATRED...)
To: PIF
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.
To: rdl6989; SunkenCiv
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
34
posted on
10/24/2020 6:18:51 PM PDT
by
TXnMA
(The Democrat Party has a single-plank platform: HATRED...)
To: TXnMA
Thanks TXnMA, both great comments.
35
posted on
10/24/2020 9:52:54 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
To: TXnMA
36
posted on
10/25/2020 3:04:57 AM PDT
by
rdl6989
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