CONTENTS. 
No. 1. 
GENERAL REPORT UPON THE GEOLOGICAL COLLECTIONS. 
BY WILLIAM P. BLAKE, 
GEOLOGIST OF THE OFFICE OF THE UNITED STATES PACIFIC RAILROAD EXPLORATION AND SURVEYS. 
INTRODUCTORY LETTER. 
CHAPTER I. 
OBSERVATIONS UPON THE MOUNTAIN RANGES AND GENERAL RELIEF OF THE SURFACE ALONG THE ROUTE. 
+ Direction and length of the line.—Barometric profile.—Six principal chains crossed by the survey.—Sandia and Santa Fé 
ranges.—Sierra Madre.—Aztec and Aquarius ranges.-—Cerbat ranges.—Ranges along weg Colorado.—Pai Ute ranges. 
ard rancisco.—Table-lands, plains, moun- 
g ; 
i near e line of survey.—Bluff borders 
of the Llano: its n and mean nile ne —Plain between the Santa Fé and Albuquerque — ze mg on eg 
adre—-Its ch —Tab — em slopes west of the Si 
slope on the west more gradual than on SCH east—Sta e descents—General elevation. _val d 
Hawilhamook—Its deep narrow character.—Plain or edm pre the Cerbat range and the Célorado river.—Valley of 
the Colorado.—Great Basin—Its ual character formed by a combination of short ridges and slopes—Inclination of 
the slopes, and their origin.—Plain and valleys bordering the Pacific. 
CHAPTER II. 
OBSERVATIONS ON THE GEOLOGY OF THE ROUTE. 
From the Mississippi river to the base of the Santa Fé and Albuquerque mountains. 
Alluvial formation of the Mississppi = Arkansas.—Bluffs.—Metamorphic rocks at Bitte Rock.— Tertiary fossils. —Carbon- 
iferous strata.—Petit Jean nelle ape: dikes. —Bituminous coal.—Fort Smith.— Poteau mountains 
and Sugar Loaf.— Coal. —Carbôniferous wage FortSm Sieg kansas. —View near Fort Coffee. —Disturbances of the 
1 China. eise of 
ero 
tion.—Lithological eet wl on mou Mary, and other mounds—Their origin explained.-—Gyp- 
in thi ite.—-Disturbed strata. emere formaticns and fossils. Ela aah of pebbles: allu- 
vium.- -Antelope hills. poe sandstone in bluffs along te.—-Table hill. Far ae sandstone near the line. 
Bluff formation or loss. tl Estacado its red ny FM ent creek— sections —Tucumcari hill.--Pyramid 
mound.—Colored section.—-Foss aza Larga. f the strata E cer fossils. -Anton Chico.—Cañon 
Blanco and Cuesta.—Galisteo. ne dyke and rolas: —Granite. 
CHAPTER III. 
OBSERVATIONS ON THE GEOLOGY OF THE ROUTE—Continued. 
Santa Fe, Albuquerque, and the Valley of the Rio Grande del Norte. 
General te Kaze and Santa Fe mountains.—View en — and the Sandia mountains. —Carboniferous lime- 
stone.—Granite. —Fossils. —Relative positions of the s Coal m res.—Absence of outcrops on the west side of 
the anui weem: rocks.—Granite.—Trap mg at alisheo: emm the headwaters of the Tuerto. ge mme 
to ruins and walls.—Quartz veins. —Volcan va, Cerritos.—Plains of lava or basalt.—Bluff at San Sedi- 
mentary deposits of the allen, of the Rio mee — Bluffs and botisitisl beds —Resemblance of the NU to shi on 
the .—Cretaceous fossils at Pablazon.— Sandstone and selenite.—Probable cretaceous age of the strata in the 
valley of the Rio Grande. —Alluvial deposits. —Soil of the valley of the Rio Granie. —Sand-dunes. — Valley of the Puerco. 
