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Regarding the results from the ten dinosaurs dated (as above), of course, bacteria do not make collagen.
And if the 14c came from contamination, for example, one would not expect the contamination to so equally affect the bioapatite and the collagen.: Dinosaur bone showing 5pmc means that, because the 14c half-life is so brief, 5,730 years, if the radiocarbon is from contamination that occurred 6,000 years ago, a full five percent, i.e., 1/20th of the bone must have been replaced.
Because radiocarbon exists in significant quantities, far above the least count (margin of error) with our state-of-the-art AMS labs doing the tests, these results can !
The Radiocarbon field itself now widely acknowledges, and tries almost desperately to discount, that specimens supposedly millions and billions of years old will yield maximum carbon-14 ages of only thousands of years!
The assumption by evolutionary geophysicists proposes that the 14c in diamonds, coal, etc., must have come from neutron capture by carbon-13 or nitrogen-14.
And as reported at Science Direct, short-lived 14c is regularly found even in supposedly billion-year-old diamonds!
* Six Problems with the Contamination Explanation: (See the 6th point below for why collagen itself cannot be contaminated with modern carbon and for the Nature 2017 paper explaining that microbes like cyanobacteria in fossils get their carbon not from the atmosphere but from their bone substrate, meaning that they cannot supply a younger date than a dinosaur fossil, because they date the same as that fossil!
) Both mathematical analysis of the data, and the nature of some of the specimens, indicate that contamination does not solve the radiocarbon problem for old-earth geologists.: While dinosaur bones, coal, and other specimens could easily be contaminated, diamonds, the hardest naturally occurring substance in the world are naturally resistant to contamination.
As a result of decomposition, to the extent that original carbon atoms were falling out of the tissue (so to speak), then to that extent you would no longer have collagen; rather, to that extent you would have humic acid.
Decomposing collagen cannot be "repaired" by free carbon atoms happening upon the decomposition.
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(Further, there is a pretreatment process of repeated washes of acid/alkali/acid to remove any outer humic acid and debris.) Therefore creationists have been correct to dispute Mary Schweitzer, Lindgren, et al., as they've tried to explain away as microbial contamination the "modern" carbon in an endogenous biomaterial Mosasaur bone. (See also this post from a committed evolutionist in a battle royale with our old friend rsr.org/david-willis at the forum run by RSR host Fred Williams.) Regarding Libby's "no known natural mechanism" way of contaminating collagen, here's our RSR explanation of why this is.