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Geosphere; February 2008; v. 4; no. 1; p. 1-35; DOI: 10.1130/GES00122.1
© Geological Society of America

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Figure 13. Geologic map of the paleovalley at Coal Mine Canyon, southeast flank of the Adobe Range (modified from Moore et al., 1982). The sedimentary sequence consists of fluvial, boulder-to-cobble conglomerate overlain by lacustrine shale, claystone, and limestone. The tuff of Coal Mine Canyon is dated at 40.7 ± 0.4 Ma (⁴⁰Ar/³⁹Ar, hornblende; Brooks et al., 1995a, 1995b) and 41.1 ± 0.2 Ma (U-Pb, zircon; Haynes, 2003).

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