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| Geologic cross section of the Pecos at Arenosa, looking downriver. A, nodular chert; B, Buda Limestone; C’, Pecos River gravels; C”, ancient upland gravels; D, Del Rio Marl; E, Pecos Valley alluvium; F, Culture bearing deposits in Arenosa; G, Salmon Peak (Georgetown) Formation. Graphic from Collins 1974, Fig. 3. |