598 NEW YOEK STATE MUSEUM 



" Till " and stratified drift 10 feet 



Quartz gravel 46 " 



Red and blue " loam " or sandy clay 20 " 



Diatomaceous earth 3 " 



Yellow and red stratified sand , 20 feet 



Red plastic clay 20 " 



Brown plastic clay 25 " 



Total 143 " 



" The bed of diatomaceous earth is of undetermined extent, 

 and appears to be replaced a little to the east by a blue clay, 

 which, however, contains some diatoms. It is undoubtedly equiv- 

 alent to the bed of ochre which overlies the sand throughout the 

 remainder of the section." 



The following diatoms, all freshwater species, occur in it. 



Melosira granulata (Ehr.) Ralfs 



8tephanodiscus Niagaras (Ehr.) 



Epitliemia turgida (Ehr.) Kutz. 



Encyonema ventricosum Kutz. 



Cyrribella delicatula Kutz. 



Cymbella cuspidata Kutz. 



Navicula viridis Kutz. 



" coconeiformis Greg. 



" major Kutz. 



" varians Greg. 



" lata Breb. 

 . Eunotia monodon Ehr. 

 Oomplionema capitatum Ehr. 

 Stauroneis Phoenecenteron Ehr. 

 Fragilaria construans Grun. 

 Synedra affinis K. B. 

 Campyloneis Grevillei var. regalis. 

 Triceratium trifoUatum 



