CONTENTS. 
CHAPTER I. 
GENERAL REMARES ON THE PHYSICAL GEOGRAPHY OF THE REGION EXPLORED. 
^ L ` * . * Pa J 
Extent and boundaries of the region.—Mountain ranges.—Trend and elevation — Table lands, their extent and ui 
elevation.—Llano Estacado. "es slopes of the plain.—Altitude.-—Bluff character of its northern borders.— 
Limit of the Llano on the ea 7—11 
CHAPTER II. 
GEOLOGY OF THE MOUNTAIN RANGES. 
beu probably granitic, with pne sus limestone.—Organ mountains.—Hueco mountains.—Los Cornu- 
os.— Polished rocks.— Guadalupe mountains.—Trend towards the Witchita mountains.—Sierra ds los Alamos 
d Los Cornudos.—Probable bad of the valleys in the granite.—Natural tanks or reservoirs of water.— 
Similar tanks in the African deserts.—Probable origin 12—15 
CHAPTER III. 
GEOLOGY OF THE LLANO ESTACADO AND THE PLATEAUX BETWEEN THE MOUNTAIN RANGES FROM 
THE RIO GRANDE TO THE COLORADO. 
Horizontal character of the strata of the Llano.— Section of the strata.-—Absence of bluffs.—Character of the 
strata underlying the Llano.—Gypsum and red clays.—Probable Cretaceous age of the upper strata of the 
ano.—-Fossils.— Cretaceous at Doña Ana.— Possible presence of Tertiary strata.— Absence of Jurassic fossils. — 
Red sandstone and Gypsum formation of Delaware creek ved the Pecos.—Gypsum um of the Andes and of Iowa.— 
Of Nova Scotia and Virginia.—Of Tuscany, Italy.—Extent of the American formation.— Geology of the plains 
between the Rio Grande and the Guadalupe mountains. pete hills.—Saline lakes.—Springs.—-Artesian wells 16—23 
: CHAPTER IV. 
REMARKS ON THE GEOLOGY OF THE ROUTE, FROM THE LLANO ESTACADO TO PRESTON, 
imi description of the country.—Red sandstone and gypsum.—Age of the Gypsum formation.— Absence o 
foss bable Cretaceous or Carboniferous age.—Gypsum of Nova Scotia in the Carboniferous.— Fort ie 
nap m Preston.—Section of strata at Belknap.—-Coal.—Carboniferous limestone.— Cross timbers. —Cretaceous. — 
Loess 24— 28 
CHAPTER V. 
BUILDING-STONE.—COAL.—GYPSUM.—LEAD.—SULPHUR. 
1. Bumprne-stoxe.—Description of the principal specimens in the collection.—Remarks upon them and their 29—30 
distribution i 
2. Coar.—Fort Belknap.—Carboniferous formation.—Lignite on the Brazos.—Probable extent of the coal....... 31—32 
3. oe — description of the mineral.—Its composition and uses.—Anhydrite.—Varieties of gypsum in 
e collection.— Description of a specimen containing carbonate of lime.—Gypsum of Plaister Cove, N. S.— 
hata: e gypsum in the arts. oeiy mined and shipped to the United States.—Remarks on the origin 
and formation of the beds.—Gypsum in the Tertiary strata of California 32—36 
4. Leap.—Lead and silver mines of the Organ mountains.— Description of the specimens.—Galena.—Cerusite... 36-—38 
5. Sunpnor.—Analysis of a dry powder from Delaware creek — 38 
