PLANTS FROM ALASKA. 153 



leavos of the fj;roup, as it is unsymmptrical in sliajjc. Tho leaf is broadly 

 elliptical in form, narrowinfj; to an obtuse lip. The basal pai't of tlie leaf, 

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

 dently not so sti'oiiiily curN'ed as the ri<iiit-hand inai'jiin. The leaf texture 

 was evidenti}' thick and leathei-y, foi' the leafl(>t leaves a v(>iy distinct 

 impression, aJthouii'h it is preserved in a coarse ijrit . The most complete 

 leafl(>t has a leiii!;th of 7 cm. It is widest near the base, whei'e it is 4 cm. 

 wide. The midnei-ve is fiat 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. 



Tliis plant is c{uite near Sagctioplcris (lopprr/idiid fi-om the Lower 

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

 Buck Mountain re<i;ion of Oregon. Tt is clearly a Sagenopteris of the same 

 tvpe, l)ut 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 Ui)per Jurassic or 

 Lower Cretaceous age. Its resemlJance to »S. Gdppertiana points to a 

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



l PLANTS FROM THE VICIMTY OF CAFF LISBURXE, ALASKA. 



A good many years ago Mr. Hem-y D. Woolfe collected a few fossil 

 plants said to be from Cape Lisburne, Alaska (see p. 14.5). They 

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

 for determination. He desci'ibed them and figured a numljer of them in 

 the Proceedings of the National Museum, published in 1S87 (Vol. X, p. 30) 

 and 188S (Vol. XI, pp. 31-33, pi. x, fig. 4; pi. xvi). He identified some 

 of them with Lower Oolitic plants, l)ut most of them with Cenomanian 

 fossils from the Atane beds of (ireenland. He regai'ded 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 



« ZigDO, Foss. Fl. Form. Oolitb., Vol. I, pp. 188-190, pi. xxi, figs. 1-5: pi. xx\i, figs. 1, 2. 



