CRETACEOUS Harebell 0-5,000 Sandstone, olive Eastern and Formation drab, silty, drab northeastern parts siltstone, and of Jackson Hole. dark-gray shale; thick beds of quartzite pebble conglomerate in upper part. Meeteetse 0-700 Sandstone, gray to Spread Creek area. Formation chalky white, blue-green to gray siltstone, thin coal, and green to yellow bentonite. Mesaverde 0-1,000 Sandstone, white, Eastern Jackson Formation massive, soft, thin Hole. gray shale, sparse coal. Unnamed 3,500± Sandstone and Eastern Jackson sequence of shale, gray to Hole and eastern lenticular brown; abundant margin of the park. sandstone, coal in lower 2,000 shale, and feet. coal. Bacon Ridge 900-1,200 Sandstone, light Eastern Jackson Sandstone gray, massive, Hole and eastern marine, gray shale, margin of the park. many coal beds. Cody Shale 1,300-2,200 Shale, gray, soft; Eastern and thin green northern parts of sandstone, some Jackson Hole. bentonite; marine. Frontier 1,000 Sandstone, gray, Eastern and Formation and black to gray northern parts and shale, marine; many south-western persistent white margin of Jackson bentonite beds in Hole. lower part. Mowry Shale 700 Shale, Gros Ventre River silvery-gray, hard, Valley, northern siliceous, with margin of the park, many fish scales; and southern part thin bentonite of Jackson Hole. beds; marine. Thermopolis 150-200 Shale, black, soft, Gros Ventre River Shale fissile, with Valley, northern persistent margin of the park,