A Little-Known Region in Northwestern Montana . 187 
NOTES ON A LITTLE KNOWN REGION IN NORTH¬ 
WESTERN MONTANA. 
By G. E. CULVER* 
CONTENTS. 
Page. 
Introductory.188 
The party.188 
Object of the journey.188 
Region traversed.188 
Previous Explorations.189 
Geography and General Description .189 
The plains.189 
The foot-hills.190 
The mountains.190 
Scenery.190 
Ahern Pass .191 
The western slope.* 191 
A side trip.192 
Mud Creek.193 
Flathead Valley .193 
Geological Notes. 193 
The plains formation.193 
The foot-hills.194 
Structure of the mountains ........ 194 
Strata exposed.195 
Igneous rocks.195 
1. Location and character of outcrops.195 
2. Petrographical notes ... .... 197 
Existing Glaciers.199 
Former Glaciers.201 
Western border of drift.201 
Ice tongues of eastern slope of Rocky Mountains . . . 201 
Ice records west of main range.203 
* 
Origin of Ice Tongues of Eastern Slope of the Rocky Moun¬ 
tains .203 
* The peti’ographical notes included in this paper were kindly furnished by Dr. Will¬ 
iam H. Hobbs, of the University of Wisconsin, to whom the writer wishes to make grate¬ 
ful acknowledgment for this and other favors. 
