SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 75, NO. 1, PL. 4 



Q 



I. Southwest face of Sinclair ^Mountain aljove Sinclair Canyon. The dark lime- 

 stone above includes the Silurian ESrisco and Beaverfoot formations with the light 

 colored Wonah Quartzite forming a white band beneath. Below the quartzite the 

 shales and sandstones of the Sinclair formation, and subjacent to this the Mons lime- 

 stones shown in the Wonah Ridge on the left. 



B— Brisco limestone. 

 Br. = Beaverfoot limestone. 



Q— Wonah Quartzite. 



S = Sinclair shales. 



M = Mons limestones. 



2. Limestone boulders nt Red Wall fault Breccia, i lie size of the boulders is 

 cated by the large hat lying on the right side. (See pi. 3.) 



iidi- 



