Posted on 05/20/2010 7:21:00 PM PDT by SunkenCiv
Impressions in a basaltic tuff located around Valsequillo Reservoir near Puebla, Mexico, have been interpreted as human and animal footprints along an ancient lakeshore, and are cited as evidence of the presence of humans in North America at 40 ka B.P. In this paper, we present new data that challenge this interpretation. Paleomagnetic analyses of the Xalnene Tuff, and lavas from the volcano from which it erupted, yield fully reversed magnetic polarities, indicating that the tuff was deposited prior to the last geomagnetic reversal (the Brunhes-Matuyama ca. 790 ka). 40Ar/39Ar dating of Xalnene lapilli and lava from the source volcano yields indistinguishable ages of ~1.3 Ma, consistent with a period of reversed magnetic polarity (C1r.2r). Additional paleomagnetic measurements of individual millimeter-size lapilli indicate that the pyroclastic grains within the Xalnene Tuff have not been disturbed or rotated since their initial deposition, thereby ruling out the possibility that the tuff was reworked by wave action along the shores of an ancient lacustrine environment. This and other evidence indicate that the marks observed in the stone quarry site are not human ichnofossils.
(Excerpt) Read more at geology.geoscienceworld.org ...
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Thanks cajuncow for this link, which was to a source we cannot alas use on FR: "Prehistoric 'footprints' falsified by science". |
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Do they also provide a translation :)
;’) Rennes hasn’t changed his initial judgment:
http://news.nationalgeographic.com/news/2005/12/1201_051201_footprints_2.html
"ka" means "thousand radiocarbon years" and "B.P." means "before present."
If I'm reading the short article correctly, the magnetic polarity test pushes the era when the prints were made back into a 700 k to 1.3 million years before present time period and the conclusion is these must be animal tracks. The bottom one might be a bear track and the top one, who knows?
“and the top one, who knows? “
Aliens.
And the print being modern and not of an ape pretty much says the dating scheme is fubar, doesn't it?
These people that don’t understand that there have been zero magnetic reversals!
Deep cores have failed to lend even a shred of support to such absurd theories.
We have learned a lot, but on ancient dating, we still make many assumptions.
Australopithecines is dated about 4-2.5 million years ago, so the age isn’t necessarily an issue.
“And the print being modern and not of an ape pretty much says the dating scheme is fubar, doesn’t it?”
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Deja vu all over again!
Dating schemes have much in common with Global Warming...
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But Australopithecines is just a monkey anyway.
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Bipedal, foot structure similar to a human. Considering all we have here is a footprint, we don’t know what the rest looked like.
On the third night, a huge black bear came out from the brush, picked up a log under each arm and turned away back to the brush. Anxious to stop the logs from being taken, the watchman jumped up and yelled, "Stop! Stop! Oh boy foot bear with teaks of Chan!!
” Everything that I have read says that magnetic reversals and pole shifts are real”
Then why are they only found near volcanic action, and tektonic joints?
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Australopithecines is a box of shards and parts found in a ten acre area, and nobody knows whether it was even one critter, let alone how it walked or crawled.
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Huh? At least 170 pole reversals have been documented.
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