SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 75, NO. 5, PL. 40 



Fi(,. I. — Helena or nnrtlieast ridge of Castle Mountain with glacial lake 

 between it and the main mountain. The clififs above the lake are formed of 

 the Eldon formation limestones, and the snow covered points above include the 

 limestones of the Bosworth formation. The distant point on the left is Stuart 

 Knob. 



Locality. — About 4 miles ( 6.4 km. ) north-northwest of Castle ^Mountain 

 Station (at T on map, pi. 26) on the Canadian Pacific Railway, Alberta, Canada. 



Fig. 2. — Profile of southeast end of Castle Mountain. The upper cliff is 

 formed of the Eldon formation limestones : the terrace with snow on it, the 

 Stephen formation, and the lower cliff and broken slope the limestones of the 

 Cathedral formation. 



Locality. — One inile (1.6 km.) north-northeast of Castle Mountain Station 

 (at 7' on map, plate 26), Alberta, Canada. 



