COAL MEASUEES OF THE DEBHAM QUADRAFGLE. 



191 



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

 from the 90-foot coal, and No. II from the 860-foot bed 



Analyses of coals from the Mansfield area. 





I. 



ir 



W ater 



1.02 

 3.76 



74.24 

 20.97 



3.08 



Volatile combustibio . . . .« 



6.22 



Carbon , 



79. 68 1 



Asb 



11.02 



Sulpbnr 



99.99 

 .56 



19.74 



100.00 

 12.81 



Fuel ratio ( tt~t '~xr ) 



VVol. comb. / 



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

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

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

 surface. 



Flora of the Mansfield section. — The followiug plauts liave bcon reported from 

 the shales at Mansfield: 



Prof Edward Hitchcock^ figured forms referable to the genera — 



Calami tes. 

 Sphenoplayllum. 

 Asterophyllites. 

 xiLii iiu 1 ana* 



Leo Lesquereux^ has described: 



Sphenopteris Salisbury! (n. s.). 

 EhacopliylluiD adnascens. 



Pecopteris. 



Sigillaria. 



Oordaites (a form close to 0. rohhii.) 



Pseudopecopteris irregularis. 



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

 of doubtful identification: 



ISTeuropteris angustifolia. 

 heterophylla. 

 Pecopteris loschii. 

 borealis. 



Pecopteris gigantea. 



Sphenopbyllum truncatum (said to be un- 

 known except to Teschemacher). 

 Splienopbyllum dentatum=erasum. 



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



2 Final Report on the Geology of Massacbusets, 1841. 



3 Providence Franklin Society Eeport on tbe Geology of Rbode Island, 1887. 

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



