Named for U.S. Coast and Geodetic Survey triangulation station ICE, sec 3, T28N, R95W, Happy Spring quad, Fremont Co, WY in Wind River basin, its type locality. Is known only in southwest part of Granite Mountains area and along east margin of Wind River Range. Composed of angular reddish-brown rocks (pebbles to boulders 10 ft diameter) mostly of quartzitic Flathead Sandstone, Precambrian rocks, Cambrian limestone, Madison Limestone, Tensleep Sandstone, and Permian chert. Contains many rounded fragments of black petrified wood. Apple-green, pink, and black nephrite jade boulders. Matrix of conglomerate is brown to yellow, arkosic poorly cemented sandstone. Is 200 ft thick at type. Overlies Wagon Bed Formation at type. Overlies Paleozoic and Mesozoic rocks, Wasatch, Battle Spring, Cody and Fort Union Formations elsewhere. Underlies White River Formation. Source area was in Wind River Mountains. Crocodile scutes and fragments of mammal bones. Is probably of late Eocene age.

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