1847.] Association of Geologists and JYafuralists. 213 



members of the Association. He stated that terraces existed on 

 the banks of the Jordan in Asia, similar in character to the ter- 

 races formed in this country. Upon the banks of our streams 

 there are generally two terrace levels. Mr. Chambers says that 

 the terraces of Great Britain bear the same level throughout the 

 country. 



Professor Hitchcock thought this could not be the case in 

 America — the terraces of the same basin might have correspond- 

 ing levels, but terraces of different basins could not possibly have 

 the same level above the ocean tide. Professor Silliman hoped 

 that members would turn their attention to this subject. He had 

 lately visited the terraces in Ne\v Hampshire, and had an oppor- 

 tunity to examine their internal structure through the cuttings of 

 the rail road through them. They presented a very beautiful ap- 

 pearance. Mr. Hall, one of the Geologists of the state of New York, 

 said that the terraces along lake Ontairo, had an almost uniform 

 height on both the Canadian and American shores. M. Desor, a 

 French gentlemen, stated that the terraces in Finmark were near- 

 ly of the same height, but not perfectly horizontal, which was 

 presumed to arise from the subsidences. 



Prof. Silliman, sen., exhibited a specimen of uncrystalized 

 Corundum from North Carolina, and stated that he had received 

 a specimen of this same mineral many years since from the same 

 state. 



Mr. Clingman of North Carolina, who had brought this speci- 

 men from North Carolina, gave an account of the circumstance of 

 its discovery, which placed the statement that it was a native speci- 

 men beyond a doubt. 



A paper was read by Mr. W. C. Redfield, of New York, " on 

 the remains of marine shells of existing species, found interspersed 

 in deep portions of the hills of drift and boulders, in the heights 

 on Brooklyn, Long Island, near New York city." These remains 

 had long since attracted the attention of Dr. Mitchell, and other 

 naturalists of the vicinity, but the true character of the formation, 

 and the peculiar positions in which the shells were found, were 

 not distinctly known to geologists. 



It fortunately happened that M. Desor and Count Portailis, 

 while on a visit to Brooklyn a few months since, discovered frag- 

 ments of those remains in the great masses of boulder-drift in 

 South Brooklyn, through which the new streets are being exca- 

 vated. At their invitation, Mr. R. had examined the place in 

 company with Professor Agassiz, and had obtained a variety of 

 specimens, which were found at depths varying from twenty-five 

 to forty feet below the original surface of the hills, in which they 

 were imbedded. 



