O Oglala Sioux Indians [7], [11]. See also [Red Cloud] Oligobunis [32] Oligocene epoch [25], [31], [46], [49], [50], [52], [53], [70], [88]; animals of [61], [63] Opossum [54-55], [60] Ordovician period [46] Oreodon [25], [54-55], [60], [63] Osborn, Henry F. [14], [38] Owl, great horned [83] [Oxydactylus] [20-21], [22], [28], [56-57], [60]
P Palaeocastor [14], [20-21], [22], [33], [64], [68-69], [70-71], [77], [86] Palaeolagus [34] Paleocene epoch [46], [53] Paleozoic era [46], [47-48] [Parahippus] [20-21], [22], [27], [56-57], [60], [62], [67] Permian period [46] Peterson, O. A. [14], [38], [39] Petrified Forest National Park, Arizona [89] Pigs [30-31] Pine Ridge, South Dakota [52] Pleistocene epoch [28-29], [46], [64], [67] Pliocene epoch [24-25], [27], [46], [52], [63] Portheus [48] Precambrian era [46] Promerycochoerus [20-21], [22], [25], [87] Pronghorn (artiodactyls) [63], [84]. See also [Syndyoceras] Protoceras [31] [Protohippus] [62], [63] Pseudaelurus [32], [58-59], [60]
Q Quaternary period [46]
R [Red Cloud] [9], [11] Rhinoceros [24-25], [50], [51], [63] Rocky Mountain National Park, Colorado [92] Rocky Mountain Revolution [51], [52] Runningwater Formation [51] Rodents [32-34]
S Sandpiper, upland [14] Scotts Bluff National Monument, Nebraska [49], [91] Sheep Creek Formation [52] Silurian period [46] Smiley Canyon, Nebraska [50] Snake, hognose [84] [Stenomylus] [14], [20-21], [22], [29], [37], [39], [50], [64-65], [86], [87]; hitchcocki, [51] Sundance Formation [48] [Syndyoceras] [20-21], [22], [31] Synthetoceras [31-32]
T Teeth, high-crowned [62-63] Temnocyon [32] Tertiary period [46], [53] Theodore Roosevelt National Park, North Dakota [92] Thompson, Albert [14], [38] Toadstool Park, Nebraska [49] Tortoise [33-34] Trailside Museum, Nebraska [86] Triassic period [46]
U Uniformitarianism [42], [43], [45] University Hill [7], [12-13], [35]; digging at, [14]; formation of [37]; tourist facilities at, [77] University of Nebraska State Museum [86]
V Visitor information [77-80], [86-92] Von Linne, Karl [43]
W Wallace, Alfred [45] White River [52]; Badlands [31]; Beds [49] Wildflowers [7], [10] Wind Cave National Park, South Dakota [91] Wren, house [82]; long-billed marsh [82]
★GPO: 1999—454-765/00504 Reprint 1999