142 



<;i;i:i:n mountains in Massachusetts. 



( )n the east side of East mountain, near the < >1 * 1 marble quarries and 

 sawmill (locality 756), there is a ledge of limestone with a thin lamination 



Fig. 38.— Specimen from the weathered end of a limestone ledge at locality 7">t; cast side of East mountain, showing a 

 plicated stratification foliation dippingto the light and acleavage foliation to the left. Photographed in inverted position. 



dipping 25° to 40° east. On a closer examination the weathered end 

 of the ledge shows that this is crossed by a plicated foliation dipping 30° 



Fig. 39.— Polished surface of limestone specimen, Fig. 38, in its natural position, facing smith, showing stratification 

 dipping west and cleavage east. From a photograph 



to 4(1 west. The presence of a little quartz in .some of the stratification 

 planes makes the plications project on the weathered surface. (See Fig. 38). 



