Difference between radiocarbon dating dendrochronology
And he doesn't mention calibration at all, anywhere - probably for obvious reasons. Is one of them C14, another tree dating, and a third historical writing? So you need to look at the right-most part of the graph, section C. The green line is irrelevant because it is an alternative source which only applies to the Old Kingdom.And despite the ad hoc nature of this kind of thing, as mentioned in my OP, he still has a fifty year discrepancy at 1000 BCE, which is worsened if, as I suspect, he's not taking into account the different half-life with which C14 dates are conventionally reported. I should probably have clarified this in my OP, sorry. Shaw and Hornung are historical chronologies of ancient Egypt.So after a quick calculation of Amenhotep IV on that graph, working with Ramsay's supplement, his conversion would place it about 130 years off. So they're based on regnal dates, astronomy, etc.Considering the licence he's given himself to just make stuff up, where the Oxford team is cruelly constrained by their actual test results, that's pretty bad... I know the red line was done by Shaw; but what did Shaw do? They're the independent benchmark against which we're checking the C-14 dates.It is pretty well fixed in relation to other chronologies, some of which can be pegged to astronomical events such as solar eclipses.
Interestingly, using these sorts of ratios, one piece of moon rock dated as being 8.2 billion years old, to the amazement of the dating laboratory involved.
So it's the grey distribution curve which is being checked against the red/blue lines of the historical record. The role of dendrochronological dating is only to "calibrate" C14 dating - that is, to correct for fluctuations in atmospheric C14 over time. The point to keep in mind is that C14 is only as accurate as the dendrochronology by which it is calibrated.
Link between radiometric dating and lightspeed Oklo What about the RATE group?
Setterfield: Atomic decay rates do not depend on the speed of light.
Both are, however, 'children' of the same parent -- the Zero Point Energy.