System 



UjPper 



Oii£ocene Upper 



Upper 



Upper 



Jurassic L otver 



Upper 



i^rchean ( ^) 



Group or Ser/es 



John Day 



E^agle Creek series 



Terrace depoa/fs 

 Glacial deposils 



Cascade 



Safsop 



Pbssi/ LaJrr t^eds (2i 



ironside beds 



Columbia L at^o 



Warrendale i-^J 



John Pay 



Si/yies River beds 



Eagle Creek beds 







7aooos^„j^ ^„jg^, 



TuFfa^ ashea^ and pos^/i'/f ^rave/a.^ 



=^2^ 



,fW^j. 



\\vi\\\\>\\ 



li^hology 



=^^^" Sands and graveh 

 ^^^'^' ^ands and grat^e/S 



/fndesilic and rhyalitic flo{ 

 docile and fufh. 



Z73S0'^^^^^ gra^efs c/ays 



Z7/50 Qaff sandy sha/a 



^h^^^'Tuffs. 



Olivine^ basolls^ tuPh, and 

 inlercalaled grai/els. 



Carbonaceous clays and tuffs 



■ Tuffs J sands and grayelSj rhyolrle- 

 Drab and bluish faff 

 fFedj green, & while shaJes, r-hyohle- 



SandSj cfaySj affd f/»e grave Is. 



Shale3_, fdfPs, rhyolilic ond 

 andesific flows . 



Sandafofjes^ conglome^ofes and 

 shales , Serpentina inlrusions . 



Park bluish^ /jne gra//?ed shales 

 and sandstones 



"'^°°' 3u/-hy//rh/c in/rusions_ granod,c 

 P?ed impure limes tone 



Calcareous shales^ limestones , 

 agglomera tej . basalts, affdesites, 

 and tuffs. 



Dark colored argilliles, cherls^ 

 clay slates^ /i/nestone tenses, 

 greenstone J eZ/onte . a/?</ gabbro 

 intrusii/es. 



Idaho formation 



Procamelus zone 



fierychippus zone 



Yaki,. 



Promerycochx ri/s xo. 

 Pfcerafhetium zone 



Payefle oF Idaho 



Monasfajh Formafioit 



Chico 



Knoxville i') 



Hargrove 



Hosjelkua hmesfone 



? Delhi formation 

 of Calaveras 



Fig. 2. — Geologic column of eastern Oregon 

 (i) These thicknesses are in most cases only approximations. 

 (2) The relationship to the Satsop is unknown. 

 (.3) The relationship to the John Day is unknown. 



