SHEET No. 26 
i2¥ 120° 30° WASHINGTON 
BULLETIN 611 
or older 
EXPLANATION 
A Stream deposits (alluvium) and glacial drift Quaternary 
GEOLOGIC AND TOPOGRAPHIC MAP . B_ Granite (Snoqualmie) 
OF THE C Lava flows (mostly Keechelus andesitic series)| Tertiary 
: D Sandstone, shale, ete. (Ellensburg and Guye | (Miocene) 
NORTHERN PACIFIC ROUTE formations) 
i) E Lava flows (Yakima basalt) 
i i F Sandstone and shale, with coal beds (Ros 
From St. Paul, Minnesota, to Seattle, Washington - indstone and shale, with coal beds (Roslyn 
; 4 SSR aa eee ree cara ean ee - nearene . 
Base compiled from United States Geological Survey Atlas ” ge G Lava flows (Teanaway basalt) and dikes Tertiary wt 
Sheets, from rai ignments and profiles supplied by & RS ce H_ Lava flows (Kachess rhyolite) (Eocene) 
the Northern Pacific Railway Company and from additional ma te SS Mr Stuart 1 Sandstone (Swauk and Naches formations), : 
information collected with the assistance of this company ng older Eocene 
& J Metamorphic rocks, probably Carboniferous 
UNITED STATES GEOLOGICAL SURVEY 
GEORGE OTIS SMITH, DIRECTOR 
David White, Chief Geologist R. B. Marshall, Chief Geographer 
1915 
Each quadrangle shown on the map with a name in parenthesis in the 
lower Jeft corner is mapped in detail on the U. S. G. S. Topographic 
Sheet of that name. 
Sheet No 27 
~ 
“ty 
t 
1 
ale 500,000 
Approximately 8 miles to | inch 
 Aete A Pe. nai 
Pee a 
Pa ee 
es IS 20 
ee 
ELEVATIONS IN FEET ABOVE MEAN SEA LEVEL ; Pa 
The di from St. Paul, Minnesota. b 10. mi 
f As 
The crossties on the railroads are spaced | mile apart wh ~ (€ A : 
- 12i° Sheet No.25 : : : : 
iz = ENGRAVED AMG PRINTED &Y THE U.SGEDLOGICAL SURIEY 
* 
