CONTENTS. 
CHAPTER V. 
General view of the structure of the Great Central Plateau. 
Common geological character of all the country between the Mississippi and Colorado.—Source and course of the Upper 
Colorado.—Table lands between Rocky Mountains and Cerbats.— Great Cafion.—Geological elements of its section.— 
Basin of the Little Colorado.—Its outlines and structure.—Ancient granitic barriers which limit it.—High mesa about 
San Francisco Mountain.—Valley of the Little Colorado —Structure of mesa bounding it on the north and east.— 
Cretaceous mesa of the Moquis villages.—Great white mesa resting on the last.—Snowy mesa bordeiing the Colo- 
rado.—Origin of the peculiar topography of the table lands referred to a vast system of erosion.—All the caiions of 
Western New Mexico due to aqueous action.—Mesa wall boundaries of broad valleys of erosion.—Area and limits of 
the Palmozoic continent.—Sources of the sediments forming the strata of the table lands and conditions of their depo- 
sition.—Outlines of North American continent approximately defined in the earliest Palaeozoic ages. 
CHAPTER VI, 
Geology of the country between the Mojave Valley and Flax River. 
Quaternary deposit of Mojave Valley.—Tertiary strata.—Black Mountains —Sitgreaves’s Pass.—Plutonic rocks with silicious 
minerals.—Tertiary rocks of eastern base of Black Mountains.—Long Valley.—Cerbat Mountains.—Yampais Valley.— 
Eastern chain of Cerbat Mountains —Fiist plateau of the table lands —Cafion of Diamond River.—Great Cajfion of the 
Colorado.—Detailed sections of its wails.—Silurian, Devonian, and Carboniferous rocks.—Granite pinnacles of ancient 
sea bottom.—High mesa west of Flax River.—Section of mesa wall at Camp 70,—Middle and upper Carboniferous 
strata. —Valley of Flax River, its general features and mode of formation.—Cafion of Cascade River.—Detailed sections 
of its clifis-—Origin of gypsum.—Companionship of sulphate of lime and peroxide of iron. 
CHAPTER VII. 
Geology of region about San Francisco Mountain. 
General features.—Relations of the San Francisco group to the beecaawed — —General ce ag —— basin of 
San Francisco mountain.—Its purely volcanic origin. —I, 
of metamorphosed rocks.—Theory of this difference.—Traces of recent siebiicue Sak the San Francisco Mountain.— 
Modern volcanic phenomena of Rocky Mountains and Pacific region.—Oscillations of level on the coast.—-Earthquakes.— 
Continued agitation of western half of the continent through all geological ages.— Local geology.—Drift of Valley of 
Little Colorado.—Trap plateaus west of San Francisco Mountain, —Ancient surface covered by it.—Section of strata from 
Picacho to Bill Williams's Mountain.—Partridge and Cedar Creeks.— Upper Carboniferous limestone.—Cross stratified 
sandstone.—Age of rocks described by Mr. Marcou on Pueblo and Cedar Creeks —No Devonian or Permian strata in this 
vicinity.—Bill Williams’s Mountain, Mount Kendrick, and Mount Sitgreaves.—Carboniferous limestone.—Modern 
volcanic cones, Camp 44.—Magnesian limestone west of Little Colorado. —Probably Carboniferous. 
CHAPTER VIII. 
Geology of region between the Colorado and Fort Defiance. 
tha Tittle fini Pee 3 * a ee ry ae Tt * . 
‘ead of the gandie nahn R n.—Its parallelism.—Variegated marls.—Painted Desert.— 
esa aac is Section of —— — Colorado and Moquis villages.— Parallelism 
of group of rocks filling interval between the Carbonif tions.—Trias of Marcou not identified.— 
Detailed sections of the variegated marls and red sandstones, salt springs of the latter series, silicified wood of the marl 
beds.—Lignite with fossil plants.—Probably Jurassic.—Eroded sandstones near Mogquis villages.—Geology of the Moquis 
a ee iled section of mragsce rt mesa.—Cretaceous fossils.—White mesa north of 
_. Moequis villages.—Upper Cret ta.—Geology of N Prevalence of Lower Cretaceous rocks.—Fresh 
ke — trnben A a abdem os of So Valley. —Cafion Bonito. —Anticlinal axis west of Fort Defiance.— 
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