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Saucedo, G.J., Fulford, M.M., Mata-Sol, A.R., and Lindquist, T.A., Location map of rock samples dated radiometrically, Chico quadrangle, California, 1:250,000, 1: California Division of Mines and Geology, Regional Geologic Map RGM-7A.S4, scale 1:1,992.