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 | |
| State | Published - Jan 1 1989 |
ASJC Scopus subject areas
- Geology
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Dorn, R., & Dickinson, W. R. (1989). First paleoenvironmental interpretation of a pre-Quaternary rock- varnish site, Davidson Canyon, southern Arizona. Geology, 17(11), 1029-1031. https://doi.org/10.1130/0091-7613(1989)017<1029:FPIOAP>2.3.CO;2