CAMBRIAN NORTH OF DIAMOND HILL. 393 



ever, be worth while to call attention to their distribution as recorded in the 

 section of this report which has been prepared by Mr. Woodworth. 



LOCALITY 4, NORTHEAST OF DIAMOND HILL. 



Along- the road from Diamond Hill northward to West Wrentham 

 exposures of granite are met almost immediately on crossing the State 

 line from Rhode Island into Massachusetts. After following the southern 

 margin of the granite hill eastward along the base of the hill for a distance 

 of several hundred feet, a change in direction of the border toward the 

 northeast takes place. Here a number of red limestone bowlders are found 

 on the hillside. Toward the brow of this hill there is a fair exposure of red 

 shales dipping at a high angle westward and striking east of north. West 

 of these, quartzitic beds probably occur, as is shown by fragments in the 

 soil and on the hillside. 



The loose bowlders on the hillside evidently are almost in situ and 

 contain HyolWies princeps t and Hyolithelhis micans f , suggesting nearer rela- 

 tion with locality 1. From the top of this part of the hill it is a distance 

 of about 100 feet to the border of the granite mass forming the main body 

 of the hill. Along the brow of the hill westward the granite is seen to 

 inclose long thin layers of an argillitic purplish or brownish rock, which 

 may possibly be fragments of Olenellus Cambrian shale hardened by meta- 

 morphism. It is impossible to determine from these inclusions whether the 

 granite of these regions is to be considered as pre- or post-Cambrian in age. 

 If the fragmental inclusions referred to be Olenellus Cambrian shales the 

 granite must evidently be considered as post-Cambrian. Post-Cambrian 

 granites are well known in the Quincy region in eastern Massachusetts. 



