RHODE ISLAND COAL MEASURES. 



161 



The coal from Cranston afforded F. A. Grooch the following analysis: 



.1 



Analysis of coal from Cranston^ Rhode Island. 



Water 



Volatile matter 



Fixed carbon 



Ash 



Total 



Sulphur 



Specific giavity, 2.209 at 150 -\ 



These troughs appear to be mainly underlain by coal-bearing shales. 

 The Sockanosset mine in Cranston comes in this section. In the valley 

 north of Providence the shales crop out in a cut in the Old Colony 

 Railroad. 



A well sunk in Butler street, corner of Bassett street, in 1895, penetrated 

 the Coal Measures. Samples of the materials brought up from certain 

 depths were furnished the Survey, through Mr, N. H. Darton, by Mr. C. A. 

 Ray, of East Providence, Rhode Island. The following table sets forth the 

 data obtained from this well. 



Record of tvell sunh in Frovidence, Rhode Island^ in 1895. 



Depth in 

 feet. 



Schist, soft, black, graphitic; with water turniBg to graphitic mud, somewhat 



too gritty for lubricating purposes 126 



Schist, micaceous, carbonaceous, carrying large cubical iron pyrites 176 



Schist, carbonaceous 300 



Schist, graphitic 341 



Grit, or metamorphic sandstone 352. 5 



Schist, graphitic, with fragments of vein quartz 419 



Goal, anthracitic; very light, with small cubic fracture and some irregular 



patches of dull black carbon 460 



Goal, cut by veins of quartz, subfibrous near walls 475 



Goal, with small cubical fracture and more of the dull lusterless carbon, about. 477 



Schist, heavy, black, graphitic, pyritiferous, about 477 



Schist, fine micaceous, pyritiferous in. layers 492 



^ Report of work done in the Washington laboratory dnring the fiscal year 1883-84 : BuU. U. S. 

 Geol. Survey No. 9, 1884, p. 18. 

 MON XXXIII 11 



