PLANTS FROM ALASKA. 153 



leaves of the group, as it is unsymmetrical in shape. The leaf is broadly 

 elliptical in form, narrowing to ..an obtuse tip. The basal part of the leaf, 

 on the left-hand side, is not entire, but the margin on this side was evi- 

 dently not so strongly curved as the right-hand margin. The leaf texture 

 was evidently thick and leathery, for the leaflet leaves a very distinct 

 impression,, although it is preserved in a coarse grit. The most complete 

 leaflet has a length of 7 cm. It is widest near the base, where it is 4 cm. 

 wide. The midnerve is flat and obscure and it does not exist for more 

 than one-third of the length of the leaf. The secondary nervation can 

 not be made out. 



This plant is quite near Sagenopteris Goppertiana from the Lower 

 Oolite of Italy," which is common also in the Jurassic formation of the 

 Buck Mountain region of Oregon. It is clearly a Sagenopteris of the same 

 tj^pe, but is apparently a new species. The leaf is broader in proportion to 

 its length than any of Zigno's forms and belongs to a larger plant. The 

 mid nerve also is not so distinct as it is in Zigno's leaves. Stanton states 

 that the shells associated with this plant indicate an Upper Jurassic or 

 Lower Cretaceous age. Its resemblance to S. Goppertiana points to a 

 Jurassic age, but a single fossil like this can not be decisive. 



4. PLANTS FROM THE VICINITY OF CAPE LISBURNE, ALASKA. 



A good many years ago Mr. Henry D. Woolfe collected a few fossil 

 plants said to be from Cape Lisburne, Alaska (see p. 145). They 

 found their way to the National Museum and were sent to Lesquereux 

 for determination. He described them and figured a number of them in 

 the Proceedings of the National Museum, published in 1887 (Vol. X, p. 36) 

 and 1888 (Vol. XI, pp. 31-33, pi. x, fig. 4; pi. xvi). He identified some 

 of them with Lower Oolitic plants, but most of them with Cenomanian 

 fossils from the Atane beds of Greenland. He regarded them as of 

 Neocomian age. 



In 1890 Mr. H. D. Dumars made a small collection of fossil plants 

 from the Corwin coal mine, 30 miles east of Cape Lisburne. These also 

 were presented to the National Museum (see p. 146). It is not 

 known whether or not the localities from which these two collections were 



' Zigno, Foss. Fl. Form. Oolith., Vol. I, pp. 18S-190, pi. xxi, figs. 1-5; pi. xxii, figs. 1, 2. 



