148 



THE INTERPRETATION OF THE PALEONTOLOGICAL CRITERIA 



On the other hand, Macoma calcarea (Gmelin) and Aligena elevata 

 (Stimpson) are distinctly northern forms, the former ranging from the 

 Arctic regions southward to Long Island Sound and the latter being 

 chiefly confined to the coast between Cape Cod and New Jersey. 



THE PLEISTOCENE FLORA 



BY 



Arthur Hollick 



The fossil plants described from the Pleistocene of Maryland were 

 obtained from two series of deposits, each series representing a distinct 

 geological horizon, different conditions of deposition and certain charac- 

 teristics of location based on the existing topography. Only a few of 

 the large number of localities examined furnished well-defined specimens 

 capable of identification. The geological horizons, localities where plant 

 remains were collected, and the nature of the deposits are shown in the 

 following table : 



Formation. 



Sunderland 



Talbot 



Locality. Nature of Deposits. 



Near the headwaters of Island Creek, 



Calvert county Buff colored sandy 



clay. 

 Point of Rocks, Calvert county Grayish sandy clay. 



Bodkin Point, Anne Arundel county Peat and coarse 



swamp debris. 



Grove Point (Pond Neck), Cecil county.. Swamp debris and 



fine sandy silt. 



Grace Point, Baltimore county Swamp debris and 



fine sandy silt. 



Tolly Point (Bay Ridge), Anne Arundel 



county Black organic silt, 



fine sand and 

 clay. 



Drum Point, Calvert county Black organic silt, 



fine sand and 

 clay. 



