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

Ronald Dorn; W. R. Dickinson

doi:10.1130/0091-7613(1989)017<1029:FPIOAP>2.3.CO;2

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

Ronald Dorn, W. R. Dickinson

CLAS-SS: Geographical Sciences and Urban Planning, School of (SGSUP)

Research output: Contribution to journal › Article › peer-review

12 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 language	English (US)
Pages (from-to)	1029-1031
Number of pages	3
Journal	Geology
Volume	17
Issue number	11
DOIs	https://doi.org/10.1130/0091-7613(1989)017<1029:FPIOAP>2.3.CO;2
State	Published - Jan 1 1989

ASJC Scopus subject areas

Geology

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10.1130/0091-7613(1989)017<1029:FPIOAP>2.3.CO;2

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AB - 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

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

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