U. S. GEOLOGICAL SURVEY. 



NORTHFIELD. 



LEYDEN ARQILLITE 



BEHNARDSTON QUARTZITE 



BECKET QRANITE. 

 CONWAY SCHIST. QNEISS. 

 ROWE S'CHIST. 



NORTHFIELD 



BERNAR03TON MICA SCHIST 

 WITH HORNBLENDE BANDS. 



GILL. 



ROWE SdHIST. 

 CHESTER AWPHlBjDLITE. 



s^voY Schist. 



BRUSH MT. schist. 



ERVING. 



MT. TOBY CONO. 

 BERNARDSTON SERIES. 



BECKET GNEISS. 



LEVERETT. 



SHUTES 



SECTIONS ALONG LI 



