Dating Fossils

Red Baron Farms said:
The paper itself isn't creationist.
Read my post. I was speaking about a hypothetical worst-case scenario.

The dichotomy comes from this: The biofilm contamination hypothesis is on the ropes, having much evidence against it.
That is your personal assessment, based on a demonstrable lack of understanding of the conditions involved (we've demonstrated it, so don't pretend that this statement isn't true). Others quite clearly disagree.
 
Read my post. I was speaking about a hypothetical worst-case scenario.

That is your personal assessment, based on a demonstrable lack of understanding of the conditions involved (we've demonstrated it, so don't pretend that this statement isn't true). Others quite clearly disagree.
Not as many as you claim. Most the things you responded with have been ruled out or made very very unlikely by the evidence and no mechanism.

I'll state it differently. Yes contamination can occur. That was the first thing people started investigating. It was the most likely. But preferential contamination in the exact ways the material is being discovered to exist is pretty improbable. You don't get animal collagen contamination on only those tissues that a living dinosaur produced collagen, and heme-iron contamination only in discrete ares where red blood cells would have been, and other organic material contaminating only the interior parts of those iron contamination blobs exactly where the nucleus would be in a red blood cell, meanwhile all these contaminates avoiding the places where in a living dinosaur they wouldn't be expected to be found...or in the surrounding rock...etc..... Contamination is one thing, selective contamination to that degree of precision? Unless you have a way to explain it? I am happy to sit back and listen.
 
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Red Baron Farms said:
Not as many as you claim. Most the things you responded with have been ruled out or made very very unlikely by the evidence and no mechanism.
You admitted to not understanding near-surface pedogenesis and groundwater flow; thus, we can dismiss everything you say on this topic. An assessment without a deep understanding of the system is meaningless at best and harmful to understanding at worst.

You don't get animal collagen contamination on only those tissues that a living dinosaur produced collagen, and iron contamination only in discrete ares where red blood cells would have been...
No, but you DO get people only LOOKING FOR this material there, either conciously or un. It's far more likely that someone screwed up than it is that some unknown mechanism that no one can figure out is at work.

Contamination is one thing, selective contamination to that degree of precision? Unless you have a way to explain it? I am happy to sit back and listen.
No, you aren't. I already have, and all you do is repeat yourself ad nausium.
 
You admitted to not understanding near-surface pedogenesis and groundwater flow; thus, we can dismiss everything you say on this topic. An assessment without a deep understanding of the system is meaningless at best and harmful to understanding at worst.
Wrong. I simply don't see the mechanism for those things to cause the selective contamination found in the fossil material. That's a very different thing than what you claim. I am happy to have you explain this preferential contamination to me. How does the contamination know exactly where to contaminate and where to avoid? How does the contamination know to make blood vessels, and how does the heme-iron get inside those blood vessels, leaving room for a later nuclear material to contaminate the center of each heme-iron contamination, but only in the reptile and bird fossils, not the old mammal fossils? How does the squid ink know to contaminate the ink sacs of a cuttlefish fossil, but not the mantel? That is what I don't understand. Seems very very very far fetched to me. You obviously completely misunderstood me. But again, please explain these things. I am happy to learn.
 
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Red Baron Farms said:
I simply don't see the mechanism for those things to cause the selective contamination found in the fossil material.
And this is based on your extensive experience with paleontological field and laboratory methods, along with an in-depth knowledge of the local pedogenic and hydrological conditions, I presume? If not, this is nothing but an argument from personal incredulity and is worth precisely as much as when Creationists try this crap.

I am happy to have you explain this preferential contamination to me.
Either read my posts or I will stop responding to you.
 
And this is based on your extensive experience with paleontological field and laboratory methods, along with an in-depth knowledge of the local pedogenic and hydrological conditions, I presume?
Certainly not. It is based on the studies I have been reading. They of course have been receiving similar commentary from other experts like you. No scientist worth his salt is going to accept any of this without ruling out other explanations. So the more recent studies have step by step been ruling out exactly the type of things you are mentioning to me. In other words they have been checking for contamination of the surrounding material to see if it came from outside or from the original material. They have been sequencing the proteins found to see if the material is animal origin or bacteria/mineral origin. It's all in the scientific literature. If not in the studies I posted, in the studies cited by the studies I posted, or in other studies I read. (and I do read both the pro and con studies as well as any scientific commentary I can find on them both) Not because I am an expert, because I found experts that knew more than me and wrote about it. That's why I am asking you. You are an expert. Please explain these inconsistencies in the contamination/biofilm hypothesis.

And please stop claiming I am so ignorant as to not know about ground water.:mad: That was you purposely obfuscating, presumably because you don't want to answer my questions about the studies I read.
 
Red Baron Farms said:
And please stop claiming I am so ignorant as to not know about ground water
You never refuted my scenario--in fact, you admitted to not knowing enough to evaluate it.

Certainly not. It is based on the studies I have been reading. They of course have been receiving similar commentary from other experts like you. No scientist worth his salt is going to accept any of this without ruling out other explanations. So the more recent studies have step by step been ruling out exactly the type of things you are mentioning to me. In other words they have been checking for contamination of the surrounding material to see if it came from outside or from the original material. They have been sequencing the proteins found to see if the material is animal origin or bacteria/mineral origin.
And this process will continue for the current generation of geologists and paleontologists. That's how these things work. You are over-eager in accepting these conclusions--we are just starting to analyze these things, and do not have a sufficient dataset to fully evaluate them. Take a broader look at geology sometime--compare this to other events--and you'll see this very distinct pattern. You can be an early adopter, and that's fine--but you don't have the knowledge to support your position (by your own admission), and my experience in this field makes me very hesitant to accept something as new and unstudied as these claims.
 
You never refuted my scenario--in fact, you admitted to not knowing enough to evaluate it.
Apparently you don't have the knowledge either, because you still refuse to answer.
Now ground water. That's different. It can and does get into very tiny spaces. But would ground water be able to first dissolve the mineral and then replace that mineral with modern hydroxyproline and hydroxylysine then remineralise it? Even with help from bacteria?
Yes I admit I don't understand how the above can occur from burrowing animals and groundwater. If you know please explain. If you don't, please say "I don't know".

PS Please also explain exactly how the modern hydroxyproline and hydroxylysine arranged itself into the precise structures found, like hollow blood vessels with discrete clumps of heme-iron, bone tissue and muscle fibers etc...
 
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Red Baron Farms said:
PS Please also explain exactly how the modern hydroxyproline and hydroxylysine arranged itself into the precise structures found, like hollow blood vessels with discrete clumps of heme-iron, bone tissue and muscle fibers etc...
Those areas present nucleation points.

Yes I admit I don't understand how the above can occur from burrowing animals and groundwater.
Organic material leaches out of modern stuff all the time--that's basic soil science. If the fossils are in any zone with groundwater, these molecules can be deposited based on local geochemical gradients. Unlike you, I do not believe that sufficient systematic analysis has been done to rule out people seeing what they want to see--I do not accept, at the current time, that only those chemicals and structures that would be expected to be found in specific tissues are present in the fossils of those tissues. So I feel no need to explain why they preferentially do so. I believe that people are often overzealous, and that they are committing errors in this case.

Apparently you don't have the knowledge either, because you still refuse to answer.
Yes, I have. So have others. The fact that you don't recognize them as answers demonstrates how little you know on this topic. There's no shame in it--but it does render your personal evaluations meaningless.
 
Traditionally, there was little hope that biomolecules might be recovered from bone more than a few thousand years old. However, 20 years ago, partial amino acid sequences were identified from the shells of mollusks ≈80 million years old (33). Gurley et al. (34) followed with a report of amino acids in the bony tissues of the Late Jurassic (≈150 million years ago) sauropod dinosaur, Seismosaurus, and more recently the small and highly acidic bone protein, osteocalcin, has been recognized immunologically in extracts of dinosaurian bone (35). Stable isotope studies (36), including those done on the specimen used in the following study (37), indicate that at least some of these molecules are endogenous to the fossils, rather than arising from younger exogenous contaminants. These results suggest that significant protein remnants may exist in fossil bone.
https://www.ncbi.nlm.nih.gov/pubmed/785470/
https://www.ncbi.nlm.nih.gov/pubmed/2054066/
http://www.researchgate.net/publica..._of_the_bone_protein_osteocalcin_in_dinosaurs
http://rstb.royalsocietypublishing.org/content/354/1379/77.full.pdf+html
https://www.ncbi.nlm.nih.gov/pubmed/17750663/
 
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That's pretty interesting. Looks like this sort of recovery has made a lot more progress than I was aware of.
 
That's pretty interesting. Looks like this sort of recovery has made a lot more progress than I was aware of.

Bear in mind that this is a lot more controversial than RBF is making it out to be. Individual molecules have been found that are remarkably old--we've been collecting fragmented dinosaur DNA for decades, for example--but tissue is HIGHLY controversial.
 
I recently saw at some CT web site that scientists had used 14C dating to determine the age of triceratops fossils at about 34,000 years.

I've done a little carbon dating in university, and I understand that the upper limit age limit using this technique is about 50,000 years.

I have a question: Is there a legitimate reason to 14C date something presumed to be >65 million years old?

Generally, it is a creationist ploy to show that the dinosaur lived in creationist times. It usually happens that they crush up a dinosaur fossil, obviously containing no carbon after replacement in the first place, and win up measuring the age of the varnish components. See this video about one such instance:

 
I miss talk.origins
Back in the days of it's Usenet Glory all this was covered and the 'young fossils' myth perpetuated by the YECs was demolished..

C14 will always give a base background reading if you use an unsuitable sample.
 
Red Baron Farms said:
Quote:
Traditionally, there was little hope that biomolecules might be recovered from bone more than a few thousand years old. However, 20 years ago, partial amino acid sequences were identified from the shells of mollusks ≈80 million years old (33). Gurley et al. (34) followed with a report of amino acids in the bony tissues of the Late Jurassic (≈150 million years ago) sauropod dinosaur, Seismosaurus, and more recently the small and highly acidic bone protein, osteocalcin, has been recognized immunologically in extracts of dinosaurian bone (35). Stable isotope studies (36), including those done on the specimen used in the following study (37), indicate that at least some of these molecules are endogenous to the fossils, rather than arising from younger exogenous contaminants. These results suggest that significant protein remnants may exist in fossil bone.
https://www.ncbi.nlm.nih.gov/pubmed/785470/
https://www.ncbi.nlm.nih.gov/pubmed/2054066/
http://www.researchgate.net/publicat...n_in_dinosaurs
http://rstb.royalsocietypublishing.o....full.pdf+html
https://www.ncbi.nlm.nih.gov/pubmed/17750663/

Yes, but we must keep in mind that carbon isotopes geochron will not work for >70Ky stuff. So, the alleged ~30Ky age for those allegedly preserved dino soft tissues can only be due to one (or more) of the following:

-Contamination due to the presence of younger material incorporated during pedogenesis.
-Lab SNAFU (assay issues).
-Sample and assay handling SNAFU (contamination, tagging errors, database issues, etc.).
-Dishonesty.
 
Yes, but we must keep in mind that carbon isotopes geochron will not work for >70Ky stuff. So, the alleged ~30Ky age for those allegedly preserved dino soft tissues can only be due to one (or more) of the following:

-Contamination due to the presence of younger material incorporated during pedogenesis.
-Lab SNAFU (assay issues).
-Sample and assay handling SNAFU (contamination, tagging errors, database issues, etc.).
-Dishonesty.
Of course. And you'll notice there are no claims of YEC on any of those sources either. The controversy is completely different. Not arguing a young material, but rather it is controversial precisely because it is claimed to be old material. The traditional view is that no original organic material could possibly survive so long.

That is completely different than the YEC claim that the material is both original and young...because original organic material can't possibly survive so long.

In reality the hypothesis under attack is the decay rates for mineralised organic material in fossils.
 
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Controversy is what makes science exciting.:D

It's also why I keep saying you're over-stating the evidence. The current evidence isn't clear--and most of the paleo community is sitting back and waiting for the dust to clear before we draw any conclusions, meaning that the literature is about a third of the total amount of work being done on this. People are talking among themselves, but being fairly cautious about publications (except the zealots, who are rushing in where angels fear to tread, as it were). Not the first time this has happened, or even the only controversial topic where this is happening right now.
 
I recently saw at some CT web site that scientists had used 14C dating to determine the age of triceratops fossils at about 34,000 years.

I've done a little carbon dating in university, and I understand that the upper limit age limit using this technique is about 50,000 years.

I have a question: Is there a legitimate reason to 14C date something presumed to be >65 million years old?

I presume CT website is Creationist website. Why would you doubt your own understanding based on something you read on those places?
 

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