BERRY: MESOZOIC FLORA OF ATLANTIC COASTAL PLAIN 171 
and the limits of the same formation are not chronologically 
coterminous when traced from locality to locality, so that final 
_ precision in correlation must wait for the discovery and study of 
abundant paleontological materials. | 
The species that have been determined from the Bingen sand 
are discussed in the following pages. This discussion is in most 
cases brief and only one or two important references to the 
literature are cited. 
FILICALES 
CY ATHEACEAE 
DicksoniA Presl 
DICKSONIA GROENLANDICA Heer 
Dicksonia groenlandica Heer, Fl. Foss. Arct. 67: 23. pl. 35. f. 8, 9. 
1882. 
Dicksonia borealis Heer, Ibid. pl. 44. f.2. > 
Anemia stricta Newberry, Fl. Amboy Clays 38. pl. 3. f. 1,2. 18096. 
This characteristic species, which has a considerable vertical | 
range in the Upper Cretaceous of the west coast of Greenland, 
is common in the middle Raritan of New Jersey and also occurs 
in the lower part of the Tuscaloosa formation of western Alabama. 
It is sparingly represented in both the lower and upper Bingen in 
Arkansas. 
OcCURRENCE: Kaolin cuts in sec. 24 T8S. R24. W, Pike 
County; Mine Creek, three and one half miles north of Nashville, 
Howard County. ~ 
CYCADALES (?) 
CYCADACEAE (?) 
PopozamItTEs Fr. Braun 
PODOZAMITES MARGINATUS Heer 
Podozamites marginatus Heer, F1. Foss. Arct. O: 43.01. 10.5.20, 
1882. 
This species was originally described from the Atane beds of : 
western Greenland. It occurs in the Raritan formation of New 
Jersey and Maryland, in the Magothy formation of New Jersey, 
