Shark’s Tooth Hill, California
128
shields 36, 37m, 286g
siderophiles 6
Sierra Diablo Escarpment,
Texas 139
Sierra Madre 244
Sierra Mountains, Argentina
102
Sierra Nevada Range,
California 212 , 247
Siljan crater, Sweden 133
Silurian period
glaciation of 140
marine flora of 110
plants of 104–122
rocks of 105
Silver Falls, Utah 178
Snake River Plain, Idaho
246
snowball Earth 59
soil bacteria 91
solar cycle 60
solar nebula 3, 4
solar system 1–6
formation of 4
structure of 5
solar wind 3, 6
Sonoma orogeny 155
South Atlantic opening 210
South Australia, Adelaide 59
South Dakota
Bear Butte 167
Spanish Peak, Colorado 246
spark discharge chamber 17, 18
species 286g
classification of 47t
diversity of 213
explosion of 67–69
migration of 157m
spermatophytes 108
sphereules 231, 286g
spicules 48
spiny anteater 239
sponges 27, 42, 48 , 71, 89,
191, 217
spores 108
squids 191, 219 , 220
starfish 90
stegosaurs 208
Stenonychosaurus 186
stishovite 233
St.Peter Sandstone 103
stromatolites 25, 26 , 28, 29,
30, 50 , 51, 71, 106, 286g
subduction 97,286g
sulfur 33, 20
Sun
origin of 3
solar output of 14, 57
sunspot cycle 60
supercontinent 43
supernova 3, 287g
suture zones 99
Swaziland sequence, Africa
39
Sweden
Siljan crater 133
symmetrodont 235T
tabulate coral 104, 112, 129
Taconian orogeny 102
Taconic Range, New York
102
Tanystropheus 162
tapeworms 51
tectonics 252–254, 287g
tektite 133
Tennessee, Rome Formation
67
tephra 287g
terranes 42, 98, 99mterrestrial species 114–115
Tertiary period 234–255
paleogeography of 238
Tethyan belt 193
Tethyan fauna 190–191
Tethys Sea 120, 140m,190,
214, 217, 227, 193, 228m,
230,254m,254–255, 287g
closing of 156, 250
Tetons,Wyoming 224
tetracorals 112 , 129
tetrapod 287g
evolution of 143
Texas
North American tektite
133
Sierra Diab lo Escarpment
139
theca 73, 111
thecodonts 162, 181 , 184,
197,287g
therapsids 166, 287g
thermophilic bacteria 20,
287g
theropods 198
Tibetan Plateau 250
tides 11, 12, 287g
till 287g
tillites 59, 121, 152, 169 , 272,
287g
Towers Formation, Australia
26
Transantarctic Mountains,
Antarctica 83, 168, 226
transgression 287g
Transvaal, South Africa 27
traps 194
tree ferns 147, 148
Triassic period 177–195
mass extinction of 189
volcanism of 192
triconodonts 235Historical Geology