VI TABLE OF CONTENTS. 



alternations of elevation and depression— The Cretaceous epoch an era of subsidence — The Tertiary, of elevation — 

 Mogollon Mountains — Probably not a distinct Bystem— Mountains of the Lower Colorado a pari of t Ho Siena 

 Nevada system— Relation of the Sierra Nevada to the Rooky Mountains— Cerbal Mountains— Wasatch Mountains— 

 San Francisco group— Reoent volcanic phenomena of the Great Central Plateau— Mount Taylor — Sierra Tucane — 



Sierras Abajo, La Sal, &0. — Structure of the Colorado plateau — Devonian and Silurian rocks of the Creat Canon — 

 Carboniferous formation — Triassio and Cretaceous rocks — Similarity of structure of the valleys of the Little 

 Colorado, San Juan. Grand, and Green Rivers — lliijli mesas of Navajo country and Upper San Juan. 



CHAPTER IV. 



(Ji'.oi.ocv OP THE BOTJTE PROM Santa IT: TO THE Siki:i:a DE LA PLATA. 



structure of the valley of the Rio Grande— The valley of the Chama — Abiquiu — Copper-mines — Fossil plants— Ruins 

 of Los Canones — Abiquin Peak — Plateau country bordering the Upper Chama — Arroyo Seco — Triassio marls — 

 Navajo Spring— Cretaceous sandstones and plateau — Banks of the Nutria — Middle" Cretaceous beds — Yada del 

 Chama— Section of valley of the Chama— High mesa of Upper Cretaceous rocks — Laguna de los Cavallos — Divide 

 between the waters of the Bio Grande and San Joan— General v iew of the structure of the surrounding country— 

 Mountain-chains — Bell of foot-hills — Table-lands — Rio Navajo — ( ierro del Navajo Sierra del Navajo — Rito Blanco— 



The PagOSa — Sierra San Juan and associated mountain-ranges — Cretaceous rocks and fossils -The l'icdra I'arada— 



Rio l'icdra — Broken mesa- -View from high divide — Rio de Los Pinos- Sierra de Los Pinos— Rio Plorido— Valley of 



the Animas— Ruins on the Animas— Crossing of the Animas — Structure of the mountains drained by the Animas — 

 Riode La Plata— Delightful camp— Cretaceous rocks and fossils— Sierra de La Plata— Metalliferous veins of the 

 Sierra de La Plata. 



CHAPTER V. 



Gkoi.ociy ok nil-: Sagi: Plain and Vai.i.ky OF THE UPPEB COLORADO. 



General features of the northern portion of the Colorado basin — Aspects and structure of the Sage plain— Mesa Verde — 

 Enormous denudation of the Colorado plateau— Crossing the Sage plain — Rio de Los Mancos— Rio Dolores — Sect ion 

 of Lower Cretaceous rocks — Ruins on the Dolores — Sierra San Miguel — Surouara — Tierra Planca — Gnajelotes — Canon 

 Pintado — Triassie rucks— Saurian hones — La Senejal — Eroded huttcs— Casa Colorado — Ojo Verd< — Sierra La Sal — 



Excursion to Grand River— Cafion Colorado— Plateau bordering the Colorado River— Eroded monuments — 

 Labyrinth Canon — Ruined buildings — Summit of the Carboniferous formation— Section of Triassic rocks — Remark- 

 able country about the junction of Grand and Green Rivers Singular eroded bnttes and pinnacles— Net-work of 



canons Canon of Grand h'ivcr— Sect ion of Carboniferous strata — Transverse section of the Colorado Valley — 

 Return to Sage plain — Journey southward to the San Juan— Sierra Ahajo. 



CHAPTER. VI. 

 Geology op the Banks op the San Juan. 



Genera] features of the country bordering the San Juan — Section of Lower Cretaceous strata south of Sierra Ahajo — 

 Bird's-eye view of country bordering San Juan— High mesas of the Navajo country— Triassio rocks of Lower San 



Juan — Lower Cretaceous strata of Camp 37— Middle Cretaceous heds and fossils south of Le Lati — -The Needles- — 

 The Crcston — Cpper Cretaceous strata at mouth of t he Animas— Kuins in the San Juan Valley— Cation Largo — 



Sections of Upper Cretaceous strata — Plateau country bordering Canon Largo — Bnttes of marls and sandstones. 



highest members of the series of sedimentary rocks composing Colorado plateau— General section of Upper Creta- 

 ceous strata— Nascimiento Mountain, its structure and relations— Notes on the different formations exposed on its 

 sides- -Journey through country bordering western hase of Nascimiento Mountain — Divide between San Juan and 

 Rio Grande — Mount Taylor — Cabiezon — Tertiary strata atJemez — The Yalles — Trap plateaus. 



i 

 DESCRIPTIONS OF CRETACEOUS FOSSILS, BY F. P.. MEEK. 



DESCRIPTIONS OF CARBONIFEROUS AND TRIASSIC Fossils, BY J. 8. NEWBERRY, GEOLOGIST OF THE 



EXPEDITION. 



