COAL MEASURES OF THE DEDHAM QUADRANGLE. 



191 



published by Dr. A. B. Emmons. 1 In the annexed table, analysis No. I is 

 from the 90-foot coal, and No. II from the 850-foot bed. 



Analyses of i 



} from the Mansfield area. 



Water 



Volatile combustible . 



Carbon.. 



Ash 



Sulphur . 



Fuel ratio I , 



■)■ 



1.02 



3.76 



74.24 



20.97 



99.99 

 .56 



3.08 

 6.22 

 79.68 

 11.02 



100. 00 



Thin sections from the core made in this boring, according to a 

 manuscript report by Prof. Collier Cobb, showed that the amount of nieta- 

 morphism varies with the depth, being greater at the bottom than near the 

 surface. 



Flora of the Mansfield section. — The following plants have been reported from 

 the shales at Mansfield: 



Prof. Edward Hitchcock 2 figured forms referable to the genera — 



Pecopteris. 

 Sigillaria. 



Cordaites (a form close to 6*. robbii.) 



Catamites. 

 Spbenopbyllum. 



Asteropbyllites. 

 Aimularia. 



Leo Lesquereux 3 has described: 



Spbenopteris salisburyi (p.. s,). 

 Rhacophyllum adnascens. 



Teschemacher 4 described and named several forms, some of which are 

 of doubtful identification: 



Pseudopecopteris irregularis. 



Neuropteris angustifolia. 

 beteropbylla. 

 Pecopteris loschii. 

 borealis. 



Pecopteris gigantea. 



Spbenophylluui truncatum (said to be uii- 



kuown except to Tescbemacber). 

 Spbenopbyllum deutatum=erasum. 



'Trans. Am. Inst. Min. Eng., Vol. XIII, 1885, p. 515. 



2 Final Report on the Geology of Massachnsets, 1841. 



3 Providence Franklin Society Report on the Geology of Rhode Island, 1887. 

 * Boston Jour. Nat. Hist., Vol. V, 1846, pp. 370-385. 



