00030 Petroglyphs (Other Keyword)
1-3 (3 Records)
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Archaeological Survey of the Leads Property, Near Valley Center, County of San Diego (T.P.M. #15463, EAD Log #78-8-351) (1979)
This resource is a citation record only, the Center for Digital Antiquity does not have a copy of this document. The information in this record has been migrated into tDAR from the National Archaeological Database Reports Module (NADB-R) and updated. Most NADB-R records consist of a document citation and other metadata but do not have the documents themselves uploaded. If you have a digital copy of the document and would like to have it curated in tDAR, please contact us at comments@tdar.org.
MEASURING THE PROPERTIES OF ROCK VARNISH ON PETROGLYPHS: A COMPARISON OF THREE METHODS OF ANALYSIS USED ON DATED GRAFFITI AND ANCIENT PETROGLYPHS AT THREE SITES IN ARIZONA
Archaeologists, as well as petroglyph and pictograph researchers more specifically, have striven for years to develop scientific means for dating petroglyphs, through both direct and indirect methods. For years, the conventional wisdom has been that the older a petroglyph is, the darker it will appear because of the constant process of varnish formation that occurs on rocks in arid environments. This study focused on analyzing varnish formation on both dated inscriptions and undated precolumbian...