First paleoenvironmental interpretation of a pre-Quaternary rock- varnish site, Davidson Canyon, southern Arizona

Ronald Dorn, W. R. Dickinson

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Dark, manganese-rich rock varnish of probable Miocene age is exhumed in a road cut in the drainage of Davidson Canyon, southern Arizona. Its structure and inorganic chemistry is similar to modern arid and semiarid rock varnishes. The δ 13 C content of organic matter in the varnish is consistent with a C 4 photosynthetic pathway for adjacent plants. Organic and inorganic chemical analyses of paleovarnishes can be used to interpret past subaerial environments. -Authors

Original languageEnglish (US)
Pages (from-to)1029-1031
Number of pages3
JournalGeology
Volume17
Issue number11
DOIs
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Geology

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