GENERAL GEOLOGY 
NOTES ON THE STRATIGRAPHY AND IGNEOUS 
ROCKS 
BY BENJAMIN KENDALL EMERSON 
with Petrographic notes by Charles Palache 
INTRODUCTION 
Stratigraphical geology and petrography form the sub¬ 
ject of this chapter. The plan of the expedition, giving 
only rare opportunities for long stops or inland excur¬ 
sions, was not so favorable for studies in this field as for 
work in many other departments of science. It was 
rather our fortune to enjoy the geology with the scenery 
of the remarkable regions we were visiting, and to contri¬ 
bute through our geological enthusiasm to the pleasure 
and interest of the party as a whole, than to bring away 
much that was new to our science. 
It was greatly to our advantage that we had with us 
Dr. Dali, who knew more of the paleontology, zoology, 
geology and hydrography of the coastwise regions of 
Alaska and Bering Sea than any other person, and Mr. 
Gilbert, whose knowledge of the geology of the western 
half of the continent is so especially full. Mr. Palache 
(ii) 
