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) |
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Pages (from-to) | 1029-1031 |
Number of pages | 3 |
Journal | Geology |
Volume | 17 |
Issue number | 11 |
DOIs | |
State | Published - Jan 1 1989 |
ASJC Scopus subject areas
- Geology