MARYLAND GEOLOGICAL SURVEY 761 



Gleichenia zippei Heer, 1874, Ibidem, Bd. iii, Ab. ii, pp. 44, 90, 97, pi. iv; 

 pi. v; pi. vi, figs. 1-3; pi. vii, fig. 2; pi. xxv, figs. 1-3; pi. xxvi, figs. 10-13. 

 Gleichenia zippei Heer, 1877, Ibidem, Bd. iv, p. 49, pi. xxxii, figs. 6, 7. 

 Gleichenia zippei Heer, 1882, Ibidem, Bd. vi, Ab. ii, p. 36, pi. iii, fig. 2. 

 Gleichenia zippei Velenovsky, 1888, Fame bohm, Kreidef., p. 6, pi. iii, 



figs. 3-7. 

 Gleichenia zippei Newberry, 1896, Mon. U. S. Geol. Survey, pt. ii, p. 664, pi. 



clxii, fig. 9. 

 Gleichenia zippei Berry, 1904, Bull. Torrey Bot. Club, vol. xxxi, p. 67, pi. 



iv, fig. 6. 



Gleichenia zippei Berry, 1906, Ibidem, vol. xxxiii, p. 164. 

 Gleichenia zippei Berry, 1911, Bull. 3, Geol. Survey of New Jersey, p. 64. 



Description. " Gl. foliis bipinnatis, pinnis valde approximatis, elon- 

 gatis, linearibus, parallel is, pinnatisectis, pinnulis obliquis, lanceolatis, 

 acutiusculis, integer rimis, basi vix unitis; nervis pinnatis, nerv. secund. 

 utrinque 3-5, inferioribus furcatis," Heer, 1868. 



The determinations of this species in the Atlantic Coastal Plain are all 

 based upon very fragmentary specimens, although some of them have traces 

 of the sori preserved. In sharp contrast is the beautiful Gleichenia mate- 

 rial obtained by Professor Heer from Greenland. As far as the Coastal 

 Plain material goes it corresponds exactly with the more typical material 

 from other regions, and until specimens are collected showing adequate 

 grounds for separation, it is justifiable to assume that this species was 

 present along the Middle Atlantic Coast in Earitan and Magothy time. 

 The genus Gleichenia was a prominent one during the Cretaceous with 

 many characteristic species, some with a wide range. The present species 

 which ranges through the Greenland Cretaceous series from the Kome 

 beds (Lower Cretaceous) to those of Patoot (Upper Cretaceous) occurs 

 also in the Lower Cretaceous of Spitzbergen and the Black Hills; the 

 Cenomanian of Bohemia; the Senonian of Bohemia, Saxony, and Bul- 

 garia ; the Magothy formation of New Jersey and Delaware ; and it has 

 recently been collected in the Upper Cretaceous of the Western Interior. 

 It is not contained in any recent collections from the Earitan. 



Occurrence. MAGOTHY FORMATION. Deep Cut, Delaware. 



Collection. Maryland Geological Survey. 



