Originally Posted by Russ
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Between 540 and 510 million years ago.


OK, good. Some actual conversation.

So, how do we arrive at those numbers? You said...

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by radiometric dating of volcanic rock deposits on either side of the deposits with Cambrian fossils in them.


OK, so how reliable are these forms of dating?
Depends on the method, the sampling protocol, and record keeping.
Using the wrong dating method on a sample can prove to be problematic. This is just like trying to measure the height of your son using an altimeter. It just doesn't work.

Some estimates have shown some properly applied dating methods to be off by as much as 20%. That would mean a 4 billion year old date for a rock has an error range of 4.8 to 3.2 billion years.

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I know that you must know that this is a very good question because there is a ton of evidence out there that radiometric dating is faulty. There is also a solid argument (superior in my opinion) that fossil dating is based on circular reasoning propelled by an agenda (like much junk science).
Fossils that have been demonstrated to be in a particular age range are used as indexes to determine which method to use for dating igneous deposits above and below the fossils.
You have an example of that ton of evidence? Put it out here and we can discuss it. Ironically, the RATE project's publication states that they found the radioactive decay evidence points to an Earth that is over 500,000,000 years old and they haven't found the method of heat removal that would be required to prevent the earth from melting if that decay happened in just 10,000 years. However, they are confident that there must have been a way for it to happen.

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My point in asking this is clear: I have found that when you walk down any path of reasoning that claims to support evolution (and I have), you find discrepancies and junk science by the boatloads. It's very much like mercury-safety science or global warming. Anyone who looks closely enough finds a clear pattern of agenda setting.
And the old earth agenda setters' names are.....? Oh! Right. That's a secret, but they're making one heck of a profit!!

A faith that connot survive collision with the truth is not worth many regrets. -- Arthur C. Clarke