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Arizona Geology Metadata | San Pedro Arizona | US EPA02-02-2007

... 8 ro 16 Ma.) Tsm - SEDIMENTARY ROCKS (middle Miocene to Oligocene; 15 to 38 Ma.) Tv - VOLCANIC ROCKS (middle Miocene to Oligocene; 15 to 38 Ma.) Tsv - VOLCANIC AND SEDIMENTARY ROCKS (middle Miocene to Oligocene) Ti - SUBVOLCANIC INTRUSIVE ROCKS (middle Miocene to Oligocene) Tg - GRANITOID ROCKS (early Miocene to Oligocene; 18 to 38 Ma.) Tso - SEDIMENTARY ROCKS (Oligocene to Eocene or locally Paleocene) TKgm - GRANITIC ROCKS (early Tertiary ...

http://www.epa.gov/esd/land-sci/san_pedro/metadata/geology.html (HTML)