trilobites 70 ,69–71, 76, 81,
96,97, 102, 112, 205, 220,
126, 231 , 134, 287g
extinction of 91,172, 173
Ibex fauna 91
Whiterock fauna 91
tube worms 33, 34
turtles 163
Tyrannosaurus rex 187, 188 ,
204,206, 208
U
Uinta Mountains, Utah 61,
63 , 182
Ultrasaurus 206
ultraviolet radiation 91,106,
232, 287g
ungulates 221, 239, 242
universe
origin of 1
Ural Mountains 155, 168
uranium 193
Uranus 5
Utah
Carmel Formation 182
Chinle Formation 164
Dinosaur National
Monument 203
Fremont Canyon 160
Great Salt Lake 267
Henry Mountains 160
Indian Canyon 92
Ladore Canyon 63
Silver Falls 178
Uinta Mountains 61, 63 ,
182
Wasatch Range 224, 225
Ute Pass, Colorado 62V
valves 75
Varanger Fjord, Norway 58
Varanger ice age 58
vascular stem 108
velociraptor 186, 203
Vendian period 55
vendobionts 55
Venus 7, 11, 14, 15
vertebrates 85,134–137, 287g
skeletons of 86
land invasion of 143
Vishnu Schist, Arizona 116
volcanic rock classification
117t
volcanism 15,242–246, 287g
extinction by 174W
Wadi Jizi, Oman 40
walruses 241
Warrawoona Group, Australia
26, 42
Wasatch Range, Utah 224,
225
Washington
Cascade Range 250
Channel Scablands 265
Columbia River basalt 245
Grand Coulee Dam 265
Mount Adams 250
Palouse Falls 245water vascular system 146
weathering 93
West Decker mine, Montana
150
Western Interior Cretaceous
Seaway 227
whales 242
whisk ferns 107, 134
Wiwaxia 80
wombats 239
woolly mammoths 268
worms 45–51, 110
borings of 49
Wyoming
Howe Ranch dinosaur
quarry 214
Tetons 224
Yellowstone 221X
Xenacanthus 127Y
Yellowstone,Wyoming 21,
220, 221 , 246
hot spot of 245
Younger Dryas period 266Z
zircon 9
zooplankton 287g
zooxanthellae algae 73Index