MONOGRAPH XXIX. PL. XXVIII. 



SUNDERLAND. 



HOLVOKE MT. 

 i DIABASE. , 



LEVERETT. 



Sea Level. 



ROWE BRIMFIELO 



SCHIST. SCHIST. 



CHESTER AMPHIBOLITE. 



\TFIELD 



AMHERST. 



BRIMFIELD FIBROLITIC RUSTY SCHIST FULL OF PEGMATITE. 



SOUTH HADLEY. 



GRANBY. 



XIX. 



SUQARLOAF 

 BLACK ROCK MT. HOLYOKE ARKOSF. 



DIABASE. DIABASE. 



UONQMEAOOW SANDSTONE. 



GEOLOGICAL MAP. 



