No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 63 



west, or from north to south, over the whole continent of America. 

 Discusses importance of rock decay and soil formation. 



(Well worth reading as indicating the unsettled state of geology at 

 this period. — Ed.) 



269. Silliman, B. 



Ice caves at Meriden and Northford. 

 Am. Jour. Sci., (i) iv, 174-177, 1822. 



Account of the ice deposits that are found in the deep ravines and 

 gorges at Meriden and Northford. 



270. Silliman, B. 



Jce caves at Salisbury. 



Am. Jour. Sci., (i) viii, 254, 1824. 



Account of the ice deposits that are found in the deep ravines and 

 gorges of Salisbury. 



271. Silliman, B. 



Bakewell's Introduction to Geology. Edited by Benj. 

 Silliman; with appendix. Outline of Silliman's course of 

 lectures at Yale, ist Am. ed., 1829. 



Mentions Connecticut river terraces, gorge at Middletown, influence 

 of geological structure on people, intrusive trap, bowlders. East Haven 

 conglomerate, diluvium. 



272. Silliman, B. 



Igneous origin of some trap rock. 

 Am. Jour. Sci., (i) xvii, 119-131, 1830. 



Discusses question of igneous or aqueous origin of trap, particularly- 

 at Rocky Hill, 3 miles S. S. W. of Hartford; "this trap is a crystalline, 

 and the sandstone under it a mechanical rock; " " trap deposited and 

 aggregated," "from a state of chemical mobility"; vesicular character 

 of trap described; contact described in detail. "For myself I must 

 say that the effects that have been produced both vipon the trap and the 

 sandstone . . . are such as I can attribute to no agent but fire."" 

 " The effects on both rocks are just such as . . . we must 

 expect from intense heat acting under great pressure." 



(If this early work of Silliman had been kept in mind, and his 

 method of investigation followed, there probably would never have beei> 

 two contradictory opinions regarding the origin of the trap rock of Con- 

 , necticut. — Ed.) 



273. Silliman, B. 



Notice of a report on the geological survey of Connecti- 

 cut, by Prof. C. U. Shepard. 



Am. Jour. Sci., (i) xxxiii, 151-175, 1837. 

 Largely an extended abstract of Shepard's report, 258. 



274. Silliman, Benjamin, (i 779-1864.) 



Biography. 



Fisher: Life of Benjamin Silliman, 2 vols., New York,. 

 Scribner and Co., 1866. 



