BULL. GEOL. SOC. AM. 



BlacKKills 



Bigbo^ 



FORMATIONS 



ToxhUls 



Pierre 



rTiobrarcL 



ft 



Carlile 

 Greeritiorn 



vGranero s - - - 



Dakota \ 



Fuson 

 Xjeckota. 

 Morrison { 



Su:rida.Tice - 



f Jtrras sic J 



Spear fish. 



TTi-ia-ssic?) 



Minnekata 

 Opeclae - - • 



IvTinneliisa 



(Pennsylvaxii arx) 



Patiasapa etc . — 



(1/Es sis sippian) 



"Whitewo o cL 



(. Or cLcrvaoion. ) 



DeadAvoodl 



( C arrLbnacn.) 



Graxate ana Gneiss 



P = ■HighfisLMississippiarLfbssiT.a 

 3T= TreTnontlimeJifone 

 "H.-1-Da.TcLmfl s art de-tone _ 



BiglaoxxL • 

 ( Ojrcl.oviciara 



DeadwoocL 



( C a.xrxbxi£inJ 



/ 



