MONOGRAPH XXXIII. PL. XVII 



LEGEND 



SEDIMENTARY ROCKS 

 Dieliton. group 



Coal measures 



Pondville arkoses and 

 quartz conglomerates 



Lower Cambrian S 

 IGNEOUS ROCKS 



Diabase dikes 



Quartz-porphyry 

 andfelsite^s 



Diamond Bill 

 quartz veins 



Pre- Carboniferous 

 rock mainly £ranitite 



Coal shafts 

 and bore-holes 



Faults 

 OUTCROPS 



~r 



Strike and dip cit ini 



portant exposures 



of strata 



Vertical strata 



Strata dip 

 uncertain 



'S OF THE MRRAGANSETT BASIN 



i'lST IN CHARGE. 



