GEOLOGIC AND TOPOGRAPHIC MAP 
NORTHERN PACIFIC ROUTE 
From St. Paul, Minnesota, to Seattle, Washington 
Base eee from United States Geological Survey Atlas 
Sheets, from railroad alignments and profiles supplied by 
the No orthern Pacific kine: Company and from a 
information collected with the assistance of this c = 
UNITED STATES GEOLOGICAL SURVEY 
GEORGE OTIS SMITH, DIRECTOR 
R. B. Marshall, Chief Geographer 
1915 
with a name in parenthesis in the 
eS. S: Tere 
David White, Chief Geologist 
ual tat carmer is oo in cae, on the U 
Shane of that na 
BULLETIN 611 
SHEET No. 20 
a 
116 00° 
‘-MONTANA-IDAHO | 
is fe 
chard = 
a Se 
Ke, 
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ve 
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“TN 
EXPLANATION 
Thickness 
in feet 
Stream deposits (alluvium) 
and glacial drift 
E Red sandstone and shale 
a, Peak formation); 
probably equivalent to the 
— formation farther 
Quaternary 
f 
F jnpase limestone (Newland) 4, 800 
G a _ shale (Ravalli craps 
yuartat 8,000 F (Belt serie 
H Blush quart sat ae 
orma 
= pieces Senna E, F, G, 
and H, have not been s sepa- 
fated and the le — is 
called simply Belt J 
J Granite, intrusive 
om 
i 
Scale 500,000 
Approximately 8 miles to | inch 
Sheet No./9 
4 
he) See oh Soomro. eran 
30’ _ 
Sh ee, Pa: Se, 20 % 
Contour interval 200 feet 
The di from St. Paul, Minnesota he 
The crossties on the railroads are spaced | mile apart 
Oo “oct Ss 
ae pe <, 
a ie ee 
oe eae ‘ 
e 
3 ot aS 
aie 
Se 
11600 
OAD 
_ 
exoMayeo ate PRINTER By THe Le GEOLoGIcAL GLEY 
