REPORT OF THE CHIEF ASTRONOMER 



557 



SESSIONAL PAPER No. 25a 



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Alluvium. 



Glacial drift. 

 Basaltic flows. 



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River and shore gra- 

 vels, auriferous 

 gravels. 



lone formation (Neo- 

 cene). 



,. 



Oregon 



and Northern 



California. 



Alluvium and 



marine sands. 

 Glacial drift. 

 Basaltic flows. 



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3 cc 

 o c3 



Eh 



Empire formation 



of Oregon; 



sandstone, 



shale. 

 lone formation, 



Cal. ; sand and 



shale. 



.. 



Central 

 Washington. 



Alluvium . 



Glacial drift. 

 Most recent of Cas- 

 cade Range lavas. 



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 d > 



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 02 



Some of Cascade 

 Range lavas. 



Snoqualmie grano- 

 diorite and gran- 

 ite, batholith. 



Ellensburg forma- 

 tion ; sandstone, 

 conglomerate. 



Keechelus andesitic 

 series. 



Yakima basalt. 



Guye formation : 

 shale, sandstone, 

 etc. 



Taneum andesite. 



Manastash forma- 

 tion ; sandstone, 

 conglomerate and 

 sliale. 



55 55 ^ 



&H 8 J « 



Alluvium. 



Glacial drift . 



Mt. Baker lavas. 



Basalt dikes cut- 

 ting Cathedral 

 granite. 



.. 



Batholiths of gra- 

 nite, granodio- 

 rite and syenite; 

 diorite stocks ; 

 Midway alkal- 

 ine eruptives. 



Older lavas, Mid- 

 w a y Volcanic 

 group. 



Kettle River for- 

 mation. 



S k a g ift Volcanic 

 formation (Eoc- 

 ene?) 



Western 



British Columbia 



and Yukon. 



Alluvium. 

 Glacial drift. 



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as 



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w 





Upper Volcanic 



group. 

 Tranquille beds. 

 Lower Volcanic 



group. 

 Cold water group. 



55 



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2 w 



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H < 

 K J 



t^ 

 O 



en 



Gravels, sands, and 



clays. 

 Glacial drift. 



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Kenai series ; friable 

 sandstones, conglo- 

 merates, shales and 

 coal seams. 



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