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Basalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite

Includes basalts of Hinsdale Fm in San Juan Mountains - Servilleta Fm in San Luis Valley and many other occurrences
StateColorado
NameBasalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite
Geologic agePhanerozoic | Cenozoic | Tertiary
Original map labelTbb
Primary rock typebasalt
Secondary rock typetuff
Other rock typesvolcanic breccia (agglomerate); conglomerate
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt
Minor
Sedimentary > Clastic > Conglomerate
Igneous > Volcanic (Volcaniclastic, volcanic breccia)
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverageArchuleta - Baca - Chaffee - Conejos - Costilla - Custer - Delta - Eagle - Fremont - Garfield - Grand - Gunnison - Hinsdale - Las Animas - Mesa - Mineral - Moffat - Park - Rio Blanco - Rio Grande - Routt - Saguache

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