MEM. MUS. COMP. ZOOL. 



GEOLOGY CAPE COD. PLATE 6 



72° 



71" 



70" 



MAP OF EASTERN MASSACHUSETTS AND RHODE ISLAND SHOWING EXTENT, DIRECTIONS OF MOVEMENT, 

 TERxMINAL MORAINES AND BOULDER FANS OF ICE SHEET OF WISCONSIN STAGE OF GLACIATION. 



By J. B. Woodworth. 

 io o to so 30 Miles 



10 o 



H H H h LM_b= 



10 



20 



30 



4o Kilometers 



Terminal moraine. 



Direction of ice movement. 

 (Generalized). 



General drift of chiastolite- 

 bearing glacial pebbles and 

 boulders from Georges Hill 

 to Block Island. 



Peridotite boulder fan 

 spreading from Mine Hill 

 to Gay Head and Block 

 Island. 



I I 



Distribution of ice-borne 

 agate pebbles probably 

 derived near Diamond 

 Hill. 



Probable trail of ice-borne 

 porphyritic dike rock 

 fragments found in drift 

 at Plymouth, Mass. 



