t-^^ L- Q^Lf°' sp P al ,, Jrt Trs 



JOHN DAY FAULT 

 QJSQtg Qal 



Tcr 



imTnTtmrrrrm miiii j i iimimmiUUWPW^ 







.■■■iinni'iimr-rrrtl 



c 



Fig. 36.2. Sections showing relations of Columbia River basalt to other Tertiary formations and 

 to pre-Tertiary complex. A-A' and B-B' near Mitchell, Ore., on U. S. 26. C-C near John Day at 

 junction of U. S. 26 and 395. Reproduced from Wilkinson, 1959. D-D' is schematic of Picture 

 Gorge area, John Day River. Reproduced from Baldwin, 1959. 



D' 



pal, metavolcanic and sedimentary rocks; sp, serpentine; pk, pre-Cretaceous rocks; Ksh, Cre- 

 taceous shale; Keg, Cretaceous conglomerate; Tel, Clarino lavas; Tci, Clarno intrusives; Tjd, John 

 Day formation; Tcr, Columbia River basalt; Trs, Rattlesnake fm.; Trt, welded tuff. 



