Rock varnish dating

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The Moab area has numerous examples of Indian rock art to enjoy.This page briefly discusses some types, dates, the artists and their cultures and how to take care of these irreplaceable sites.Technique: analyzed by X-ray diffraction (reveals clay mineralogy), infrared spectroscopy, electron microscopy, microprobe, bulk chemical analysis, TAMS dating, isotope analysis. Dating: 12,000 yr) dates for human artifacts in Mojave Desert (Dorn et al., 1986). Rock varnish coats many surfaces of geomorphic and archaeologic interest in arid lands.All varnish dating techniques are limited by the time lag between the exposure of a surface to subaerial processes and the onset of varnishing.

Matthews, J 2014, 'Rock-varnish microlamination (vml) dating', in Matthews, J (ed.), , edited by John A.

For each dating or chronological method there is a link in the box at right to take you to that section of this page.

There, you will find a brief description of the method, plus links to take you to other webpages with more extensive information.

Perhaps because its ability to alter a landscape’s appearance dramatically (Fig.

8.1), the literature on rock varnish remains one of the largest in the general arena of rock coatings (Chapter 10 in Dorn 1998).

They are valid only where manganese is not remobilized after deposition, for example, in most arid environments.

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