130 G-EOLOGY OF THE NAERAGAKSETT BASO. 



Carboniferons. The single but pronounced meridional strike of the outcrop 

 near Jndson post-office proves that the Great Meadow Hill syncline does 

 not extend to the eastern margin, and we are led, therefore, to infer that 

 other synclines exist in this heavily drift-covered region. The east-west 

 strikes of the Carboniferous in Hanover, where they are in close proximity 

 to the border rumiing north and south, make it almost necessary to suppose 

 that there has been faulting along this line. Granite of a euritic texture 

 occurs south of Plympton, setting an eastern limit to the Carboniferous, and 

 there is thus no evidence to show that the Carboniferous extends toward 

 Cape Cod Bay east of the line drawn on the map. 



In the Furnace Pond area reliance has been placed upon the distribu- 

 tion of the glacial drift, the incoming of granitic blocks in large quantities 

 being taken as the approximate northern position of the granitite on the 

 south of the basin. The line across the lakes, in Lakeville, is wholly 

 conjectural, but is confirmed by the position of granitite exposures three- 

 fouiiihs of a mile southwest of Elders Pond. 



From Lakeviiie to Steep Brook — From thc viciuity of Myrfcks soutliwcstward 

 the contact begins to take on a topographic expression and is marked by an 

 ice-worn granitic escarpment, at the foot of which runs the Assonet River. 

 Just south of Myricks the valley of Swamp River breaks through the 

 granitite and is taken advantage of by the New Bedford branch of the Old 

 Colony Railroad. In Freetown the granitite is exposed in Washington 

 Mountain and near Break Neck Hill Finally, at Steep Brook, seen on 

 the Fall River sheet, the basal arkoses and conglomerates are found resting 

 on the granitite and dipping off northwestward at an angle of 45°. 



INLIERS. 



In addition to the facts regarding the outlying boundary of the Car- 

 boniferous, a few statements may be made concerning the contact of the 

 formation with the inliers which have been noted in this portion of the 

 basin. Inliers are conspicuous features on Newport Neck, Conanicut Island, 

 and in tiie region about Bristol, for a description of which the reader is 

 referred to Dr. Foerste's section of this report. 



There is only one definitely determined inlier in this northern part of 

 the baBin— that of Hoppin Hill, in North Attleboro— though it is possible 

 that there are others, as at Namasket and in the Cambrian locality near 

 Diamond Hill. 



