CONTENTS. 
6 
CHAPTER VI. 
DESCRIPTION OF THE FOSSILS COLLECTED BY CAPTAIN JOHN POPE. 
: Page. 
Exogyra.—Gryphea.—Productus.—Remarks in conclusion TE 39—40 
CATALOGUE OF THE GEOLOGICAL COLLECTION. 
l. Rocks and minerals.—2. Fossils EN 41—42 
NOTE IN EXPLANATION OF THE MAP AND SECTION. 
INDEX .... 45—41 
ILLUSTRATIONS. 
GEOLOGICAL MAP OF THE ROUTE. ‘ 
GEOLOGICAL SECTION FROM PRESTON TO THE RIO GRANDE, NEAR EL PASO. 
