Named as a member of Wasatch Formation for exposures on north side of La Barge Creek. Type section designated 1 mi east of town of La Barge in sec 8, T26N, R112W, Lincoln Co, WY in the Greater Green River basin. Rests unconformably on Chappo Member (new name) of Wasatch. Intertongues westward with conglomerate member of Wasatch. Composed of brightly colored (red, purple, orange, green, yellow, tan, brown, gray) mudstone, siltstone, sandstone, conglomerate, marlstone, and limestone. Conglomerate occurs locally as lenses; proportion of conglomerate increases west. Thickness not uniform, locally more than 1,500 ft thick. Is an extensive sheet deposit that underlies most of the Greater Green River basin. Contains vertebrates and gastropods. Regarded as middle? or Lysite? and late early, or Lost Cabin, Eocene age. Overlain by Fontenelle Tongue of Green River Formation. Is the middle unit (of 3) formerly assigned to main body of Wasatch.

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