WEST OF THE (JOVE AND PATTAQUAMSCOTT RIVEE. 247 



and its northward extension, McSparran and Hammond hills, is made up 

 of the granite, reddish, medium to finer grained, diked and blotched by- 

 pegmatite. Occasionally there is a slight tendency toward schistosity in 

 some of the outcrops. 



The valley of Indian Run was at one time probably also occupied by 

 Carboniferous rocks. Near the southern end, toward Peacedale, several 

 exposures of the Carboniferous still remain. Directly east of Peacedale, 

 on the southern side of a steep hill, partly wooded, a strongly metamor- 

 phosed rock, possibly belonging to the Carboniferous series, is exposed; 

 strike N. 50° E., dip 70° SE. The rock here has a decidedly gneissoid 

 structure, being composed of white quartz with white and black micas and 

 some other black mineral. The darker minerals are often arranged in layers 

 between the lighter-colored ones. Some of the whiter streaks may repre- 

 sent original pebbles. Apparently some of the larger granitic and quartz- 

 vein pebbles have suffered less drawing out and remain more recognizable. 

 These exposures are at the extreme limit of macroscopically recognizable 

 clastic rocks. Farther up the hillside occurs a reddish porphyritic gneiss, 

 apparently representing a granite with phenocrysts of feldspar. All rocks 

 named are cut by the regular reddish granite with pegmatite blotches and 

 dikes. Similar exposures of the gneissoid — possibly Carboniferous — rock 

 occur where the road east from Peacedale crosses Indian Run. 



On Rose Hill, west of Mooresfield, occurs the granite with pegmatitic 

 variations. Apparently the more gneissoid form, with crushed and stretched 

 porphyritic feldspars, also occurs here. Directly northward 2£ miles, on 

 Congdon Hill, more granite occurs. Some of it is the ordinary type of 

 these regions, with pegmatitic phases. Other portions appear gneissoid, and 

 some exposures here are similar to the gneissoid Carboniferous schists east 

 of Peacedale. 



It is evident that the extreme western limit of rocks whose clastic 

 origin can readily be recognized has here been reached. This is not equiv- 

 alent, however, to asserting that the original western limit of the Carbonif- 

 erous deposits of the Narragansett Basin in this direction lias been attained. 

 It is probable that they once extended farther westward, but in the limited 

 time at the writer's command detailed study of these more western areas 

 was not possible. 



