FOSSIL FLORA. 707 



QVERCUS Sp. 

 PI. LXXXIX, fig. 7. 



This is a fragment of the l)ase of what appears to have been a hirge, 

 thick knif. It has a tliiek midrib, and alternate, thin, parallel, straight 

 secondaries, which arise at an angle of about 45°. None of the finer 

 nervation is preserved. 



This has some resemblance to the liasal portion of \\liat lias been 

 described as Q. cuJverl (\). 7()S), Ijut it was several times larger tlian this 

 and lacks the marginal toothing. They come from the same beds. 



Habitat: Yellowstone River, one-half mile below mouth of Elk Creek, 

 at base of bluff: collected by F. H. Knowlton, August, 1888. 



QuERCUS OLAFSENi Heer. 



Quercus ohi/.seni Heer: Fl. Foss. Arct., Vol. I, p. 109, PI. XLVI, fig. 10. Lesquereux: 

 Cret. and Tert. Fl., p. 224, PI. XLVIIl, tig. i; p. 245, PI. LIV, fig. 3. 



There are a number of examples of tliis species, some of which are 

 ver}^ well preserved. They are, with the exception of some minor details, 

 identical with the figures given b}^ Heer and Lesquereux. Thus only 

 occasionally are they doubly dentate, and the secondaries rarely branch. 

 They are undoubtedly the same as the leaves figured l)y Lesquereux. 



This species was reported \)y Lesquereux from the Ba<l Lands of 

 Dakota (Fort Union group), and from Table 3Iountain, California 

 (Miocene?). 



Habitat: Yellowstone River, one-half nnle below the mouth of Elk 

 Creek, top of bluff; collected 1)}- F. H. Knowlton, August 27, l.SSS. 



QuERCUS YANCEVI 11. Sp. 

 PI. LXXXIX, fig. 2. 



Leaf of firm texture, broadly lanceolate, somewhat wedge-shaped at 

 base and acuminate at apex, with undulate toothed margin; midrib strong, 

 straight; secondaries !l or 10 pairs, alternate, remote, emerging at a low 

 angle, curving upward, the lower ones arching along the border, upjjer 

 ones entering the teeth or often arching along and joining the one next 

 above; nervilles few, irregular, broken; finer nervation forming irregular 

 areolae. 



