On Thursday, July 26, 2012 10:29:15 AM UTC-6, Nivalian wrote:
> On Thursday, July 26, 2012 11:27:31 AM UTC-4, Tom McDonald wrote:
> > On Jul 26, 9:43�am, Nivalian &
amp;lt;rhed...@gmail.com> wrote:
> > > We haven't found any rabbits in the Pre-Cambrian, but we all know that it's a phrase that simply means a fossil out of order or in the wrong sequence. �Now since many people believe in The Theory of Evolution as a fact, they don t question it. �They will use whatever evidence that either contradicts or affirms it and change the theory so it fits the evidence. �In science, you are to gather the evidence/data and come up with a good theory. �The Theory of Evolution works the other way around making it a worldview. �You cannot falsify a worldview. �If a worldview makes a prediction and doesn t turn out the way it should, then that worldview adapts to the new evidence and proclaim that it sheds new light .
> > >
> > > One example (and yes there are much, much more), I ll begin with the Mexican footprints. �I used this example before but unfortunately the website created by a team of scientists that vehemently supported these footprints with scientific data, is now gone.
> > >
> > > Here s an article in 2005 about the Mexican footprints:
http://www.sjsu.edu/faculty/kojan/page3/files/Gonzales_footprints_200...
> > > Here are some excerpts from that article:
> > > The discovery of human footprints in the Valsequillo Basin of Central Mexico challenges this model, providing new evidence that humans settled in the Americas as early as 40,000 years ago.
> > >
> > > Most early human occupation sites in the Americas date to the latest Pleistocene or Ice Age, between
> > > 10,000 and 12,500 years ago. The existence of 40,000 year old human footprints in Mexico means that the Clovis First model of human occupation can no longer be accepted as the first evidence of human presence in the Americas.
> > >
> > > By laser scanning the footprints, Professor Matthew Bennett and Dr Xavier Velay from the University of Bournemouth, were able to create 3-d images and models of the footprints. The actual footprints remain in situ in the Mexican quarry. The 3-d models allowed the researchers to categorise the footprints according to their size and shape. Approx. 60% of the prints are human, with 36% of the human prints classified as children s because of their size. Several short trails of footprints are visible in some parts of the quarry and it is estimated that the adult humans were between 117 and 190 cm tall.
> > >
> > > Now pay close attention to this excerpt
> > >
> > > The footprints are indisputably human because they have some unique characteristics, including:
> > > 1) pedal arches, where foot bones form two perpendicular arches that normally meet the ground only at the heel and ball of the foot. These arches are found only in humans
> > > 2) where it is possible to see toe impressions, there is a non-divergent big toe (or hallux) which is about twice the size as its adjacent toe
> > > 3) the fact that they have deep heel and ball impressions, encircled by the typical figure of eight contours
> > > 4) they fall within the size range for modern Homo sapiens
> > >
> > > Also, just as important, read this closely as well
> > >
> > > Previous attempts to date the basin s sediments and animal bones have had variable and controversial results, with finds dated from around 9,000 to 35,000 to even 200,000 to 600,000 years ago.
> > > There have been significant advances in dating techniques since the controversial excavations at the Valsequillo Basin during the 1960s. Dr Gonzalez and her team used the following techniques to date the human footprints and the sediments above and below these trace fossils:
> > >
> > > - Accelerator Mass Spectrometer radiocarbon dating (AMS) was carried out on mollusc shells and organic balls at the Oxford Radiocarbon Accelerator Unit (ORAU) by Dr.Tom Higham and Dr.Chris Bronk Ramsey.
> > > - Electron Spin Resonance (ESR) on a mammoth molar found at the Barranca Caulapan in the Valsequillo Basin by Professor Rainer Gr n at the Australian National University, Canberra.
> > > - Optically Stimulated Luminescence Dating (OSL) on sediments and the Xalnene Ash by Dr.Jean-Luc Schwenninger at the Oxford Luminescence Laboratory.
> > > - Argon-Argon dating on the Xalnene Ash and overlying lava was carried out by Dr Simon Kelley, Open University.
> > > - Uranium series dating on animal bones from the Valsequillo Gravels by Dr. Alistair Pike at Bristol University
> > > Two things you should remember, 1) the dating methods and 2) the undisputed footprints.
> > >
> > > Here s another article about the footprints:
http://news.nationalgeographic.com/news/2008/06/080606-ancient-footpr...
> > >
> > > In that article they go on to say for the dependable dating methods
> > > Just to be sure, her team also used carbon-14 dating to determine the ages of shells in the sediments above and below the ash layer.
> > > "You can't date just one layer," she said. "You have to makes sure the whole stratigraphy makes sense."
> > > The sediments immediately below the ash were between 70,000 and 100,000 years old, Gonzalez's team found.
> > > The sediments immediately above the ash ranged from 9,000 to 40,000 years old. The dates of all three layers therefore suggest the footprints were made about 40,000 years ago, she said.
> > > And here are excerpts about the human footprints
> > >
> > > To make sure the footprints were indeed human, Gonzalez's team made 3-D images with a laser scanner, then compared them to human footprints made by volunteers marching up and down a beach in the United Kingdom.
> > >
> > > "Now we are quite happy to give the word that these are indeed [human] footprints," she said.
> > > "We know there were adults and children," she added, adding that looking at the prints was touching.
> > >
> > > They are many articles and pictures on the net so feel free to search for more. �I just wish that one website was up and running because it had great pictures showing the left-right stride and all of the dating methods.
> > >
> > > Here s another article with more information:
http://www.sciencedaily.com/releases/2009/02/090226141102.htm
> > >
> > > Okay, the point is of this story is that the footprints are out of place. �At really out of place if you want to accept the other different dates dating in the millions. �And remember what I told you about paying close attention to the footprints and the dating because the story isn t over. �Now you are about to witness science at work
> > >
> > > After reading everything above, that has all now changed. �The evidence about the dating methods, the footprints etc are no more. �You see the evidence didn t jive with the evolutionary worldview. �Therefore, the evidence will change. �Now below is the link of how science falsifies the human footprints:
http://www.usatoday.com/tech/science/columnist/vergano/2010-05-16-foo...
> >
> > I'm fairly familiar with this situation, though it's been a while
> > since I last looked into it deeply.
> >
> > The issue is not about human evolution, but about the dating of a set
> > of probably-human footprints. The oldest dating, at ca. 40,000 ybp, is
> > anomalous, but only wrt the issue of when and how modern humans made
> > it to the Americas. There is a lot of evidence that humans might have
> > been in the Americas, especially South America, long before the Clovis
> > culture, ca. 12,500 ybp. In fact, recent work has shown that even in
> > North America south of Alaska, dates going back something like 1-2
> > thousand years before Clovis are probable.
> >
> > There are several models of the Peopling of the Americas. The main
> > contender, the northern route via Beringia, appears most likely for
> > North America, at least.
> >
> > However, there are other suggested models, including trans-Atlantic
> > (ca. 20,000 ybp); trans-Pacific (various dates); and coastal routes
> > via the Aleutians, and down the western coast of North America. Some
> > of these models suggest dates of from 15,000 to 20,000 ybp.
> >
> > The Mexican footprints, if shown to be human (and it seems likely to
> > me that they are), and if shown to be dated to well before 20,000 ybp
> > (a much longer shot, in my view), would make for a great deal of
> > excitement among archaeologists studying the Peopling of the Americas.
> >
> > I think you are trying to say that the 'Establishment' (in this case
> > archaeologists) is trying to cover up the anomalous findings in
> > Mexico. However, if you'd actually followed the conversations about it
> > among archaeologists, you'd see that the main problem with them is
> > that there are no other archaeological finds that come close to
> > corroborating the early dating of those footprints. IOW, we have the
> > prints, of disputed age, but no stone tools, campfires, human skeletal
> > remains, remains of plants or animals that can be shown to be used by
> > humans, or any other firmly dated archaeological evidence for humans
> > in the Americas that early.
> >
> > Even if your insinuation about 'Establishment' nefariousitude in this
> > matter were 100% correct, it would have zero impact on the Theory of
> > Evolution, or any of the evidence for it. Showing that there are
> > controversies in science, in this case archaeology, is only stating
> > the obvious. There are tons of controversies in science; in fact,
> > scientists welcome controversy, since this spurs further
> > investigations and advances science. Which is, rather, the point of
> > science.
> >
> > I also notice that you have become a born-again believer in
> > radiometric dating in this case. Good for you! Now apply that to other
> > radiometric observations and you too may become less ignorant.
>
>
> Tom - the crux of this topic is to show that the dating methods simply do not work. You can call them a good guess, but just don't call them accurate, scientific, reliable, etc.
>
> Also I don't think you read the whole thing. The dating of the ash is now millions of years old and the footprints are not footprints because humans were not around then. Does that sound logical or scientific?
Here's a USA Today article discussing the matter:
http://www.usatoday.com/tech/science/columnist/vergano/2010-05-16 footprints_N.htm
The article on the improved dating:
http://www.nature.com/nature/journal/v438/n7068/full/nature04425.html#a1
It is most definitely scientific, and it appears that this item is a tough nut to crack. It is tough, both from the age dating side of it, and from the
track identification side as well. It is not obvious that these are human
tracks.
From:
http://www.nature.com/nature/journal/v438/n7068/full/nature04425.html#a1
"Geochronology: Age of Mexican ash with alleged 'footprints'
Paul R. Renne1,2, Joshua M. Feinberg2, Michael R. Waters3, Joaquin Arroyo-Cabrales4, Patricia Ochoa-Castillo5, Mario Perez-Campa6 and Kim B. Knight2
Top of pageAbstract
Arising from: R. Dalton Nature doi: 10.1038/news050704-4 (2005)
A report of human footprints preserved in 40,000-year-old volcanic ash near Puebla, Mexico (
http://www.royalsoc.ac.uk/exhibit.asp?id=3616&tip=1), was the subject of a press conference that stirred international media attention1. If the claims (
http://www.mexicanfootprints.co.uk) of Gonzalez et al. are valid, prevailing theories about the timing of human migration into the Americas would need significant revision. Here we show by 40Ar/39Ar dating and corroborating palaeomagnetic data that the basaltic tuff on which the purported footprints are found is 1.300.03 million years old. We conclude that either hominid migration into the Americas occurred very much earlier than previously believed, or that the features in question were not made by humans on recently erupted ash."
The geochronology work reported by: Renne et al. (2005) combines multiple methods of
age dating (paleomagnetic and 40Ar/39Ar dating) and so what these authors
report is perfectly good science which cannot be ignored. Note that they say "hominid" because there were no modern humans 1.3 million years ago (this is well established).
It didn't end there. There are a number of papers back and forth. If you
read the USA Today article, you get an idea of what the process is like.
http://www.usatoday.com/tech/science/columnist/vergano/2010-05-16-footprints_N.htm
The Gonzales group now accepts the 1.3 million year age date. It has not
really been established that these are footprints at all. To see images
of the alleged tracks go to.
http://www.nature.com/news/2005/050704/full/news050704-4.html
It does not appear to be an example of fraud on the part of the scientific
community, but the result of the normal process of science. An honest
controversy well documented by the exchange of papers.
-John