MARYLAND GEOLOGICAL SURVEY 231 
Occurrence.—SuNDERLAND Formation. Near the headwaters of Is- 
land Creek, Calvert County. 
Collections.—Maryland Geological Survey. 
Order POLYGONALES. 
Family POLYGONACEAE. 
Genus POLYGONUM Linne. 
POLYGONUM sp ? 
Description.—Numerous seeds of this genus occur in the various swamp 
deposits, especially at Grace Point, but accurate specific identification is 
not possible. 
Occurrence.-—TatBot ForMATION. Grove Point, Cecil County; Grace 
Point, Baltimore County. 
Collections.—Maryland Geological Survey. 
Order ROSALES. 
Family PLATANACEAE. 
Genus PLATANUS Linne. 
PLATANUS ACEROIDES Geepp. 
Plates LX XIII, LXXIV. 
Platanus aceroides Geepp, 1855, Zeitschr. Deutsch. Geol. Gesellsch., vol. iv, 
Dp. 492; Tert. Fl. Schossnitz, p. 21, pl. ix, figs. 1-3. 
Description—This widely represented species is hardly to be distin- 
guished from the living P. occidentalis L. and there would be no incon- 
sistency in considering them as identical. 
The fragments figured on Plate LXXIII may be compared with those 
figured by Heer from Spitzbergen, (Fl. Foss. Arct., vol. i, pl. xxxii, figs. 
1, 2; ibid., vol. iv (Foss. Fl. Spitzb.), pl. xvii, figs. 1, 2 and xxxi, fig. 3), 
Greenland (Fl. Foss, Arct., vol. vii, pl. xc) and Switzerland (Fl. Tert. 
Helvet., vol. li, pl. Ixxxvii, figs. 3, 4 and Ixxxviii, figs. 10, 11) and the 
Smaller leaves on Plate LXXIV with similar ones on the plate last cited. 
Gaudin and Strozzi also figure a number of specimens from Italy (Mem. 
