708 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



The leaf figured is the only one of this species observed. It is 10 cm. 

 long and 17 mm. wide in the broadest part, which is about the middle. 

 The entire leaf, with the exception of a fragment at the base, is preserved. 

 The margin is entire for the lower third, then it is undulate-toothed, the 

 teeth being rounded or rarely with a minute sharp point. In the lower 

 part the secondaries arch and join, while those above either enter the teeth 

 or join by a long loop and send a branch from the outside to the teeth. 

 The finer nervation is well preserved, forming irregular meshes. 



This beautiful species does not seem to be very closely related to any 

 fossil oak with which I am familiar. Perhaps its nearest relative is Q. 

 laurifolia Newby., 1 from "burned shales, over lignite beds, Fort Berthold, 

 Dakota," the age of which is not well indicated, but is certainly Tertiary. 

 It has only very faintly undulate-toothed margins, and the secondaries are 

 at a more acute angle than in the one under discussion. 



I have named this species in honor of Mr. John Yancey, proprietor of 

 the stage station, and the namer of the fossil forest near by. 



Habitat: Yancey Fossil Forest; slope near the standing trunks; col- 

 lected by Lester F. Ward and F. H. Knowlton, August 10, 1887. 



QUERCUS CULVERI 11. Sp. 

 PL LXXXVII, fig. 5. 



Leaf small, of thick, firm texture, approximately oblong in general 

 outline, obscurely 3-lobed; margin strongly, irregularly toothed; teeth 

 obtuse or rounded, pointing* outward, separated by broad, shallow sinuses; 

 petiole slender; midrib rather slender, nearly straight; secondaries 6 

 pairs, subopposite, emerging at an angle of about 45°, or the 2 lower 

 pairs only 25°, all nearly straight and entering the teeth; third pair of 

 secondaries longest, entering the lateral lobes, witli branches on the lower 

 side which pass to smaller teeth; nervilles strong, apparently broken; finer 

 nervation not preserved. 



This beautiful species is represented only by the specimen figured. It 

 is a small leaf, being about 7.5 cm. long, including the petiole, which does 

 not seem to be entirely preserved, and 5 cm. broad bewteen the lateral 



1 Proc. U. S. Nat. Mus., 1882, p. 505; Plates ined., PI. LIX, fig. 5. 



