U. S. GEOLOGICAL SURVEY. 



IM.KISTOCKNK CKKTAUKOLIS 



(Coiu^'alutff otho?- 



KH 



CAKBON I I-'I'.ROUS 

 Cool Mf.isiins Sub riu-lioniliToiis 



Cs 



ni-;voNi.\N 



SIMIHIAN 



I'lipciSihirinn Lower Siliiiioii 



pi?i';i,iMiNARY c;kc)i,oc;ic 



Compilvd In' H.U. 11^1144 to aixoiiip; 



