156 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Beaverf oof Trough 



Silurian 



/6 00'/'4B7.7/nJ 



Qrdovician 



Z3(>0' (719.3 m.) 



Ozarkian 



340O'(l03<>rimJ 



Upper Cambrian 



ZlS0'ljB38.ZmJ 



GoodsirTrough 



Good5ir 



i400'(l3SOJm.l 



vOHouiia fauna 



Ottertail 



lAZS'lJ'Si.-im.j 



Chancellor 



4S00'(l37l.im.) 



\Pre-Cambrlan I 



Bo^ Trough 



UpperCambrlan 



3^l7'fl04I.Sm.J 



Middle Cambrian 



4SaO'//39-S:i mj 



//y^>y>y///////. 



Loiver Cambrian 



369S'(ll2(>.Zm I 



Pre-Cambrian 



Fig i6-Stratigraphic sections of the Bow, Goodsir, and Beaver foot 

 Trouehs Each section is placed with reference to the time at which the 

 various formationrwere deposited. Thus the sediments of the "PPer Portion 

 of the Lower Cambrian (Mesonacis zones) were deposited in the Bow and 

 Beave'rfooTTroughs aboutShe same time, but.there is no record of - d os,- 

 tion of sediments of this time in the Goodsir Trough. These sections serve 

 to further explain the diagrammatic outlines of hg. 15. 



