LANCE FLORA OF EASTERN WYOMING 135 



Family FAGACE^ 



Genus DRYOPHYLLUM Debey 



Dryophyllum subfalcatum Lesquereux 



(Pkte 8, Figs. 2, 4, 6, 7) 



Dryophyllum {Quercus) subfalcatum Lesquereux, U. S. Geol. and Geog. Surv. Terr., Bull., vol. 1, 379, 1876; 



U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1874), 301, 1876; Rept. U. S. Geol. Surv. Terr., vol. 7, 



163, pl. 63, fig. 10, 1878. Knowlton, U. S. Geol. Surv. BuU. 163, 41, 1900; Proc. Washington Acad. Sci., 



vol. 11, 211, 1909. Dorf, Carnegie Inst. Wash. Pub. No. 508, pt. I, 51, pl. 5, figs. 1, 2, 6, 1938. Brown, 



U. S. Geol. Surv. Prof. Paper 189, 248, pl. 50, figs. 1-8, pl. 51, figs. 1-7, 86, pl. 52, figs. 1-3, pl. 54, fig. 1, 



1939. Dorf, Bull. Geol. Soc. Amer., vol. 51, 218, 222, 225, 1940. 

 Dryophyllum aquamaruin Ward, U. S. Geol. Surv. 6th Ann. Rept., 551, pl. 37, figs. 3-5, 1885; U. S. Geol. Surv. 



BuU. 37, 26, pl. 10, figs. 2-4, 1887. Knowlton, U. S. Geol. Surv. Prof. Paper 101, 299, pl. 70, fig. 2, 1917. 

 Dryophyllum bruneri Ward, U. S. Geol. Surv. 6th Ann. Rept., 551, pl. 36, figs. 6-9, 1885; U. S. Geol. Surv. 



Bull. 37, 27, pl. 10, figs. 5-8, 1887. Knowlton, U. S. Geol. Surv. Prof. Paper 101, 259, pl. 53, fig. 5, 1917. 



Hollick, U. S. Geol. Surv. Prof. Paper 159, 70, pl. 38, fig. 2, 1930. 

 Dryophyllum falcatum Ward, U. S. Geol. Surv. 6th Ann. Rept., 551, pl. 37, fig. 10, 1885; U. S. Geol. Surv. 



Bull. 37, 27, pl. 11, fig. 1, 1887. Knowlton, U. S. Geol. Surv. BuII. 163, 42, pl. 8, fig. 1, 1900. 

 Quercus gracilis Newberry, Proc. U. S. Nat. Mus., vol. 5, 504, 1883; U. S. Geol. Surv. Mon. 35, 75, pl. 67, fig. 



4, 1898. 

 Quercus doljensis Pilar. Ward, U. S. Geol. Surv. 6th Ann. Rept., 551, pl. 36, figs. 9, 10, 1885; U. S. Geoi. 



Suiv. BuU. 37, 25, pl. 9, figs. 4, 5, 1887. 

 Quercus ivhitnumi Knowlton, U. S. Geol. Surv. Prof. Paper 155, 52, pl. 17, fig. 5, 1930. 

 Quercus turbuknta HolUck, U. S. Geol. Surv. Prof. Paper 159, 70, pl. 38, fig. 3, 1930. 

 Rhus pseudo-meriani Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 293, pl. 58, fig. 11, 1878. 

 Fraxinusl priru:etoniana Knowlton, U. S. Geol. Surv. Prof. Paper 130, 161, pl. 22, fig. 7, 1922. 

 Salix sp., Knowlton (2 spp.), Proc. Washington Acad. Sci., vol. 11, 207, 1909. 



As in the Medicine Bow flora, the leaves of this distinctive type are among the dominants 

 of the Lance flora in the Lance Creek area. They are also reported by Brown as abundant in the 

 Colgate and true Lance (Hell Creek formation) of eastern Montana. The Lance Creek specimens, 

 of which 2 are here figured, show the same kind and degree of variation as is apparent in the leaves 

 of this form in the Medicine Bow, the Hell Creek, and the Black Buttes floras. 



The systematic status and the stratigraphic significance of this species have been fuUy dis- 

 cussed in my report, cited above, on the Medicine Bow flora. 



Occurrence— Locahties P365I, P3854, P3855, P3857, P3858, P3859. 



Collection—V. C. Mus. Pal., Plesiotypes Nos. 2497, 2498, 2499, 2500. 



Genus QUERCOPHYLLUM Fontaine 



Quercophyllum gardneri (Knowlton) Dorf, n. conib. 



(Plate 9, Fig. 3) 



Quercus gardneri Knowlton, U. S. Geol. Surv. Prof. Paper 101, 259, pl. 38, fig. 3, 1917. Dorf, Bull. Geol. Soc. 



Amer., vol.51, 222, 1940. 

 Quercus rockvalensis Knowlton, U. S. Geol. Surv. Prof. Paper 101, 259, pl. 38, fig. 4, 1917. 



There are 4 fairly complete specimens, from two locahties, which I cannot distinguish from 

 the type and figured Vermejo specimens which Knowlton referred to the two species above. I 

 can see no vaUd grounds for their separation; tlie slight differences in a few tertiary veins between 

 the two Vermejo specimens, and between these and the Lance Creek example figured, can hardly 

 be regarded as of specific importance. No other recorded leaves from the late Cretaceous or 

 early Tertiary have comparable features. 



These leaves bear an undeniable resemblance to the leaves of several existing oaks, such as 

 Quercus undulala Torrey, as is pointed out by Knowlton, and more especially Q. sinuata Walter 

 and Q. margaretta Ashe of southeastern United States. These are generally more prominently 

 lobed, however, and have stronger veins. In view of the absence of positive evidence of relation- 

 ship to Quercus, it is thought best to refer the fos.siI species to the less definite form genus Querco- 

 phyllum. 



Occurrence — Localities P3853, P3858. 



Collection—M. C. Mus. Pal., Plesiotype No. 2501. 



