188 
INDEX. 
Page. 
Canyons, spring-formed alcoves on sides 
of, occurrence and features 
of 127-130 
Canyons in the region, occurrence and 
features of 123-126 
Carboniferous rocks east of Snake River, 
occurrence of 46 
Caverns formed by lava, occurrence and 
features of 94 
Chamberlin, T. C, reference to paper by. 156 
Chapman's Ranch, springs at, occurrence 
and features of 166-167 
Cinder Buttes, aa near, occurrence and 
characteristics of 97-98 
bombs from, characteristics of 75-79 
clots from, characteristics of 75 
dust and lapilli from, characteristics 
of 74-75 
elevation and features of highest of . . 73-74 
elevations comprising, composition of ;."-' ^> 
granite near, outcrop of 41 
lava from, analysis of 87 
corrugations and arches in 92-97 
lava cakes from, characteristics of . - 79 80 
lava flows from, plate showing pres- 
sure folds in surface of 92 
relative age of 105 L07 
lava sheets from, depressions in sur- 
faces of 101 102 
lavasheetsnear,fissuresandfaultsin LIS ll'.t 
lava streams from, features of 82 -87 
lava surface (blistered) and corruga- 
tions on lava stream, plate 
showing 90 
location and features of - . 72-112 
pahoehoe near, occurrence and char- 
acteristics of 91-92 
parasitic cones from, features of 80 82 
plate showing ',:> 
relation to older volcanic eruptions 
of 1 107 L12 
scoria from, characteristics of 75 
surface features around 89-98 
vegetation on 73 
volcanic bombs from, plates showing. 76, 78 
volcanic rock from, characteristics 
of 74-80 
Cleft, basalt near, plate showing fault 
scarp of 126 
crater rings near, features of 110-112 
map showing 110 
lava at, fissure in 119-120 
well at, depth and temperature of 173 
Climate, effect upon rocks of 144-145 
relation of springs to 154-156 
Climate of the region 1 7-22 
local variations in 19 
Clots from Cinder Buttes, characteristics 
of 75 
Clover Creek Valley, hot springs in, 
source of heat of 153 
Columbia River lava and Snake River 
lava, relation of _•_ , _ _ _ 60-61 
Cope.E.D.,namegiventoPlioceneLakeby 51 
Crater rings near Cleft, map showing 1 10 
plate showing 110 
features of 110-112 
Page. 
Crater walls, stratification of 74 
Crockett, E. M., artesian well on ranch 
of, features ef ._ 176 
D. 
Dall, W. H., determination of fossils by . - 58 
Dana, J. D., cited on aa 98 
cited on lava balis . 114 
openings in lava mentioned by, ex- 
planation relative to cause of. 94-95 
quoted as to generic characteristics 
of lava surfaces 91-92 
reference to 88 
Darwin, Charles, reference to drawing of 
bomb by 77 
Desert varnish, formation of 143, 144 
Dikes of acid and basic rock, occurrence 
of 41 
Diller, J. S., examples of desert varnish 
described by ■ ... 106 
Drill holes, suggestions relative to 1 84-185 
Dry Creek, artesian well near, features of 177 
Dunes, sand, occurrence and features of . 140-141 
Dust from Cinder Buttes, characteristics 
of. 74-75 
Dust storms, occurrence of 21 
E. 
East Butte, character of 16 
composition of 45 
elevation of 34 
location and features of . _ 34-38 
plate showing 34 
shape of .... 38 
slopes of, character of 36 
vegetation on 38 
Endlich, F. M., reference to report by 46 
F. 
Faults in the region, occurrence of 47-48, 
L19 l:.'l 
Fauna of the region 24 
Ferguson A., estimate of volume of The 
Thousand Springs by 27 
reference to 163 
Fissure eruptions, hypothesis of. 61-63 
Folds in rocks of southern Idaho, occur- 
rence of 48 
Forests in the region, occurrence of 22-23 
Fortieth Parallel Survey, reference to 
reports of 44 
Fossils of the region, species of , 56-57 
Tertiary ( Miocene ) age recorded by . _ 15 
G. 
Geikie, A., quoted as to origin of Snake 
River lava 62 
Geologic structure, relation of springs to 154-156 
Geological history of the region 15-16 
Geology of the region 38-134 
Gilbert, G. K., examples of desert varnish 
described by 106 
reference to monograph by 79 
Glenns Ferry, fresh-water shells collected 
near 56 
rim rock in bluffs at. origin of 70 
sand drifts near 140 
test well suggested at 179 
