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Correcting with more measurement and geometrical relationships the Cernohouz and Sole method (1966, which measured the retreat from the supposed “fresh” edge of a cristal to the actual edge), and knowing the weathering rate, it is possible to obtain the period of exposition of a (mostly quartz) crystal truncated by the engraving activity. 879) The oldest date assured by the micro-erosion method (at Canada do Inferno) was “about E6500 -2000 BP” (-7-, p.879), it means 8500-4500 BP: not a very defined range, indeed.They then used these measurements to estimate an age for the bone.But radiodating cannot proceed without some primary assumptions: the starting conditions of a given sample (e.g., how much of each isotope was present in the beginning), a steady rate of decay of certain radioactive isotopes of elements called radioisotopes, and a lack of tampering with the system (e.g., elements added or subtracted since the radioisotope "clock" first began counting time).

Amazingly, it was dated at millions of years older than the sedimentary rocks The data from one of the San Juan Basin dinosaur limb bones showed a range of "ages" from roughly 15 to 85 million years.

Most of these test samples were selected to measure the numerical age of a petroglyph for which there was good relative evidence as to its age…”.

So called blind-tests conducted at Côa have been conducted with different rules, assuming “a priori” their validity, completely unrelated with any other local archaeological research.

There was not enough time available to determine a local calibration curve!

But we can see in a picture (Archaeometry) that Onega Lake engravings have been executed on a horizontal surface.

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Their new technique involved first polishing a slice of bone and then shooting a laser beam onto its surface.

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