

GEOLOGY OF THE KAEEAGANSETT BASIif. 



RED ROOK AREAS. 



There are eight areas in the northern part of the basin in which reddish 

 rocks have a surface exposure^ and in these they are brought to the surface 

 by strong folding. 1. In North Attleboro and the adjoining towns of Wren- 

 tham, Massachusetts, and Cumberland, Rhode Island, a large horseshoe- 

 shaped area wrapping about a knob of granitite in Hoppin Hill and the 

 North Attleboro Cambrian outcrops. 2. A small lens-shaped area extendinpf 

 northeastward from Central Falls, Rhode Island, into Massachusetts. 3. A 

 still smaller area south of the last, extending northeastward fron) the gorge 





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Area tfow exposbcf Arccf ptobatit^ now covered Arta probably oro«l^a«Hr^ 



*->■ Oireof-lcns in which the formation (fecresrses in ffjiohnes^ 

 f Possible ek/fosures 



FiCt 11 —Map showing distribution of red sediments 



of the Blackstone in Pawtucket. 4. A characteristic elongate narrow area 

 extending along the northern margin of the main basin and traceable as far 

 as the North River in the town of Hanoyer. This area is probably con- 

 nected at the west with the succeeding, 5. The largest area of all, extend- 

 ing from No. 1, near Sheldon ville, northward and eastward to Braintree, 

 forming the greater part of the strata in the Norfolk County Basin. There 

 axe exposures in (6) Attleboro and (7) Rehoboth, and one in (8) Norton, 

 which may belong to a different horizon. I shall begin the account of these 

 fields mth the ^ea along the northern border of the main basin. 



