PLATE,XVII 



FORMATIO X a lo ,irf 13 LAC K R 



/// .Ircti oii.i 2,1l,i4,faa/itf22, 

 Town 21 Rautfe 

 JACKSON CO. 



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Lower Siluriu i 



Gi'auite ItornblemlpMaafiLeHiauFerru&uTious Polsdjuli 

 Rot-k Si-liisl (>iiartzS<-lii.s+ Sandstone- 





