GEOLOGIC AND TOPOGRAPHIC MAP 
NORTHERN PACIFIC ROUTE 
From St. Paul, Minnesota, to Seattle, Washington 
Base compiled from United States Geological Survey Atlas 
Sheets, 
Northern Pacific Railway Company and fro 
information collected bebe the assistance of this company 
UNITED STATES GEOLOGICAL SURVEY 
GEORGE OTIS SMITH, DIRECTOR 
David White, Chief Geologist R. B. Marshall, Chief Geographer 
1915 
Cc 
with a name if parenthesis in the 
lower ‘left corner is mane in pee on the U. S. G. S. Topographic 
heet of that nam 
BULLETIN 611 
Sheer No. /5 
C95 DEO 
SHEET No. 14 
een OM ha A IT ERC ATE OIE RE # 
NO" 10930" 109° MONTANA 
EXPLANATION 
Thickness 
in feet 
A Stream deposits (alluvium) Quaternary 
B — aeons and shale (upper part of Fort Union 
ormati 
C White sandstone and shale (middle part of Fort Union : 
formation) Tertiary 
shale and sandstone composed largely of volcanic 
materials (Lebo shale member of the Lady eres 
formation) including voleanic agglomera’ 1,500 
J F Sandstone and shale (Lance formation) 1,600 =‘ Tertiary(?) 
AR 
oe J G Dark shale, marine deposit (Bearpaw) 900) he 
Shale and sandstone, —_~ water deposits 
(Judith River formati 600 
: : : Upper 
I Sandstone and shale, marine deposits (Claggett formation) 600f Cretaceous 
ss Upper and middle parts J Sandstone and shale, with coal beds (Eagle sandstone) 200 
i ae Fort. sUnion K Dark shale, marine deposit (Colorado) 1,300, 
SEA atic > B 507 3 ‘. Formations C. D, F, G, H, and‘i change toward the west into dark voleanic 
c a materials ai d near the western border of this area a re grouped into the 
a 
EE yf tin se ts 
: a4 Se 
ae os ‘ef ed ee 
a ee > eg : ce 
Y abe, L ¥ 
Sheet No. /3 
~ 
se a ee 10 20 2s 
Spe TS Ae Re Se eo ER EE Sar e 
Contour mace 200 feet 
E& MEAN SEA LEVEL 
dia 
St. Paui, Minnesota. 
~” 
Ti aiepotiee ius wig: vidlbdede ane jmassit wile sins 
ENGRAVED AUD SRINTED BY THE U-S.GEQLOGICAL SURVEY 
