Rock varnish dating
In an accompanying rebuttal, Dorn acknowledged that his method for dating rock surfaces was fundamentally flawed.But he denied any impropriety, calling the suggestions of sample content manipulation “utterly false”.The dating method devised and used by ASU's Ronald I.Dorn was shown to be largely meaningless in an article published in Science by researchers from four institutions, including the University of Arizona in Tucson.
In varnish collected from the Cima volcanic field, California, distributions of the minor elements used in cation-ratio (CR) dating reflect varnish stratigraphy as defined by the major elements Mn, Fe, and Si.
The Arizona scientists say they found pieces as large as 1 mm across.
Bell said that a microscopic examination of 5 of the 15 Nevada samples — which were analysed at the Rafter Radiocarbon Laboratory in New Zealand — also found pieces of this size.
Rock Varnish: that this pattern was indeed global, then variations of its color and chemical com- we would have strong evidence that a position.