64 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



Dana: Am. Jour. Sci., (2) xxxix, i-io, 1865. 

 Caswell: Nat. Acad. Sci., Mem., i, 101-112, 1877. 



Pop. Sci. Mon., xxiii, 259-266, 1883. 



275. Silliman, B., Jr. 



Dr. Percival, the original discoverer of the crescent- 

 formed dikes of trap in the New Red sandstone of Con- 

 necticut. 



Am. Jour. Sci., (i) xlvi, 205-206, 1844. 



Credit given to Percival to correct a misunderstanding. 



276. Silliman, B., Jr. 



Report on the intrusive traps of the New Red sandstone 

 of Connecticut. 



Am. Jour. Sci., (i) xlvii, 107, 108, 1844: Assoc. Am. Geo!., 

 Proc, 14, 15, 1844; Neues Jahrb., 728, 729, 1845. 



Abstract of the conclusions concerning the origin and formation of 

 the sandstone and trap of Connecticut. Sandstones laid down in 

 "angular position," dipping easterly; igneous dikes entered sediments 

 far below surface; present topography due to enormous northerly cur- 

 rent. 



277. Silliman, B., Jr. 



On fossil trees found at Bristol, Connecticut, in the 

 New Red sandstone. 



Am. Jour. Sc, (2) iv, 116-118, 1847. 



Description of two fossil coniferous trees found in a sandstone 

 quarry on the banks of the Pequabuck river near Bristol. 



278. Silliman, B., Jr., and Whitney, J. D. 



Notice of the geological position, and character of the 

 copper mine at Bristol, Connecticut. 

 Am. Jour. Sci., (2) xx, 361-368, 1855. 

 (See Whitney and Silliman, 296.) 



279. Smith, A. 



On the water courses and the alluvial and rock forma- 

 tions of the Connecticut river valley. 



Am. Jour. Sci., (i) xxii, 205-231, map, 1832. 



Statement of the course and extent of the valley of the Connecticut. 

 General discussion of the disintegration of primitive rock strata into 

 gravel, sand, clay. Mention of the Primitive (crystalline) formation. 

 Description of the Secondary (sandstone and trap) formation and dis- 

 cussion of its origin. 



280. Smock, J. C. 



Geological-geographical distribution of the iron or*s 

 of the eastern United States. 



Am. Inst. Min. Eng., xii, 130-144, 1884. 



The Connecticut ores discussed are magnetite, Laurentian, Fairfield 



