224 THE AMERICAN MONTHLY [July 



Analysis of the Raised Coast Period Clay. 



By ARTHUR M. EDWARDS, M. D., 

 NEWARK, N. J. 



The analysis of the raised coast period clay was made 

 by Prof. B. Silliman and published by Prof. J. W. 

 Bailey in a paper entitled : "Notice of some new local- 

 ities of Infusoria, recent and fossil" (Amer. Jour. Sci. and 

 Arts, 1844, Vol. XLVII, page 337). He examined the 

 clay, blue clay, from New Haven, perhaps the same as 

 the Quinipiac marshes, in which W. A. Terry has des- 

 cribed the Diatoms, Being used as a fertilizer, an analy- 

 sis was made. When magnified it is found to contain 

 particles of quartz, hornblende and feldspar derived 

 from the rock granite of the Grreen Mountains which 

 were brought down when it was formed, in the glacial 

 period. There were seen the following diatoms : 



Actinocyclus senarius. 

 Coscinodiscus excentricus. 



" oculus-iridus. 



Cocconeis oceanica. 

 Dicladia ? 



Eunotia westermanni. 

 Galionella (Melosira) sulcata. 

 Grammatophora oceanica. 

 Pinnularia perigrina. 



" lyra. 



" didyma. 



These are all Naviculas now, for I quote Bailey's origi- 

 nal list. 



Raphoneis rhombus. 

 Tesselo catena. 

 Dictyocha specutum. 



fibula. 

 Spongioliars caput-sepertensis. 



