Jurassic sedimentary and volcanic rocks

Sandstone and conglomerate derived from volcanic rocks with associated intermediate-composition lava flows, breccias, and tuffs. In southern Arizona this unit includes rocks of the Artesa sequence, Pitoikam Formation, Mulberry Wash volcanics, Rudolfo Red Beds, Recreation Red Beds, and Gardner Canyon Formation. In western Arizona it includes the Harquar Formation, rocks of Slumgullion, and related(?) unnamed units in the Kofa and Middle Mountains. This unit is characterized by maroon, brown, and purplish-gray volcanic-lithic sandstone and siltstone, with subordinate to abundant conglomerate, quartz-rich sandstone and sparse limestone. (150-170 Ma)
State Arizona
Name Jurassic sedimentary and volcanic rocks
Geologic age Jurassic
Lithologic constituents
Sedimentary > Clastic > Siltstone (Tuffaceous)
Sedimentary > Clastic > Conglomerate (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Carbonate > Limestone (Bed)
Igneous > Volcanic > Felsic-volcanic (Volcaniclastic)
Stratigraphic units Gardner Canyon Formation, Rudolfo Redbeds, Recreation Redbeds, Topawa Group, Artesa sequence, Harquar Formation, rocks of Slumgullion

Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.

Tosdal R.M., Haxel, G.B., and Wright, J.E., 1989, Jurassic geology of the Sonoran Desert region, southern Arizona, southeastern California, and northernmost Sonora: Construction of a continental-margin magmatic arc, in Jenney, J.P., and Rey

NGMDB product
Counties Cochise - La Paz - Pima - Santa Cruz - Yuma