MARYLAND GEOLOGICAL SURVEY 775 



although they present no character aside from difference in geological 

 horizon to warrant their separation. 



Occurrence. MAGOTHY FORMATION. Eound Bay, Anne Arundel 

 County. 



Collection. U. S. National Museum. 



PODOZAMITES MARGIN ATUS Heer 



Plate LI, Fig. 8 



Podozamites marginatus Heer, 1882, Fl. Foss. Arct, Bd. vi, Ab. ii, fig. 10 



(non Berry 1903). 

 Podozamites marginatus Newberry, 1896, Mon. U. S. Geol. Survey, vol. 



xxvi, p. 44, pi. xiii, figs. 5, 6. 

 Podozamites marginatus Berry, 1911, Bull. Torrey Bot. Club, vol. xxxviii, 



p. 410. 



Description. " Pinnules rather large, varying from 15 cm. to 20 cm. 

 in length, very variable in width, which ranges from 1.5 cm. to 3 cm., the 

 Tuscaloosa specimens of minimum rather than maximum dimensions. 

 Apex and base pointed, the angle dependent on the width of the pinnules. 

 Base somewhat thickened and more or less abruptly narrowed in wide 

 forms. Veins parallel, very fine and numerous, thirty or more in num- 

 ber. Texture thin but probably coriaceous. 



This species was described by Professor Heer from the Atane beds 

 of western Greenland and was illustrated by a single rather poor figure. 

 It was afterward tentatively identified by Newberry from the middle 

 Raritan of Woodbridge, New Jersey, and by the writer from the Tusca- 

 loosa formation of Alabama where it is abundant. Whether these occur- 

 rences are identical with the type is not certain, although such identity is 

 probable. The writer has recorded this same species from the Magothy for- 

 mation of New Jersey, 1 but this material proves to be referable to .the 

 subsequently discovered genus Doryanthites of the Black Creek formation 

 in North Carolina and homotaxial deposits in Georgia and Alabama. 



The present species shows considerable similarity to the Lower Cre- 

 taceous species Zamites tenuinervis Fontaine, which is so common in the 

 Patapsco formation of the Potomac Eiver Valley. 



1 Berry, Bull. N. Y. Bot. Garden, vol. iii, 1903, p. 99, pi. xlvi, figs. 1, 3. 



