APPENDIX. 



Section in West Central Massachusetts — Continued. 



547 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics 



Unconformity 



|-~ i Becket gneiss. 



-v~^^ Unconformity 



| - ! Washington gneiss. 

 o'S | Base not exposed. 



2000? 



2000? 



White biotite gneiss, locally grading into con- 

 glomerate. 



Rusty biotite-gneiss. 



Silurian strata much folded and metamorphosed, but not so severely as the earliei 

 strata. Devonian strata less folded and metamorphosed than the Silurian. Triassic 

 beds tilted and much faulted, though little folded or metamorphosed. 



