Name applied to a formation chiefly of volcanic origin for Norwood Canyon in T3N, Rs2 and 3E, Morgan Co, UT on the Wasatch uplift. No type locality designated. Was included as part of Salt Lake group (Hayden, 1869) and Salt Lake formation (Mansfield, 1927). Occurs in Ts2 and 3N, Rs3 and 4E north and south of East Canyon Reservoir, on the sides of Morgan valley and west of Ogden valley. Geologic map; cross sections. Is 50 to 2,000 ft thick. Is younger than the unconformably underlying Knight formation of Wasatch group. Is older than the Lake Bonneville sediments. Consists of tuff with lenses of volcanic conglomerate that are more numerous to south. Vertebrate fossils (titanothere, artiodactyl) found in quartz sand beds, gray quartzite pebble lenses, and poorly consolidated tuff. Resulted from volcanic eruptions that flooded the back valleys of the central Wasatch from the Heber to the Ogden valley in early Oligocene, Chadronian time.

Source: GNU records (USGS DDS-6; Denver GNULEX).

A K-Ar age of 38.5 Ma on biotite and sanidine from about 700 m above base near a late Eocene fossil locality near Porterville, Morgan Co, UT on the Wasatch uplift, and a biotite K-Ar age of 29.6 Ma and Zr F-T age of 28.6 Ma on a lithic-crystal tuff about 600 m above base in East Canyon graben in southern Morgan Co, establish a framework for the Eocene and Oligocene age of the Norwood. Is about 1,000 m thick in the deepest part of the graben and near Porterville.

Source: GNU records (USGS DDS-6; Denver GNULEX).