6 
CONTENTS 
CHAPTER VI. 
DESCRIPTION OF THE FOSSILS COLLECTED BY CAPTAIN JOHN POPE. 
Page. 
Exogyra.—Grypheea.—Productus.—Remarks in conclusion. 39—40 
CATALOGUE OF THE GEOLOGICAL COLLECTION. 
1. Rocks and minerals.—2. Fossils...... 41—42 
NOTE IN EXPLANATION OF THE MAP AND SECTION. 
INDEX. 45—47 
ILLUSTRATIONS. 
GEOLOGICAL MAP OF THE ROUTE. 
GEOLOGICAL SECTION FROM PRESTON TO THE RIO GRANDE, NEAR EL PASO. 
