THE 
AMERICAN GEOLOGIST. 
Vol. XXXI. FEBRUARY, 1903. No. 2 
GEOLOGY OF THE JEMEZ— ALBUQUERQUE 
REGION, NEW MEXICO. 
By Albert B. Reagan. 
PLATES IV-XII. 
CONTENTS. Page. 
General description tjs 
History 69 
Structure. 
Nature of Rocks 69 
General secliions 70 
Nacimiento Mountains 71 
Cochiti Range 7^ 
The Plateau 73 
The San Dia Mountains * 73 
Sedimentary Deposits. 
Carboniferous 73 
The Permian 74 
The Red Beds 74 
Age of the Red Beds 76 
The Gypsum Series 77 
Age of the Gypsum 78 
The Cretaceous Strata 7S 
The Fox Plills 79 
The Fort Union Beds t;o 
The Puerco Marls yi 
The Tertiary Strata jj3 
The Eocene Formation 83 
The Pliocene Strata S5 
The Jemez Marls 8.5 
The Albuquerque Marls 86 
The Pleistocene Deposits . . 86 
Jack Rabbit Vahey 86 
Vallecieto Viejo 8(j 
Placita Marl 87 
Deposits of the Jemez Valley 8S 
The Rio Grande Marls 89 
Age of the Rio Grande Deposits 89 
Resume of the Stratigraphy of the Region 9U 
Geography and Physiography. 
Rivers yi 
The Rio Grande y 1 
Age of the Rio Grande 91' 
The Rio Puerco 92 
The Jemez River yL' 
Age of the Jemez River 9o 
Tributaries of Jemez River at the North 93 
