FOX HILLS AND LOWEK MEDICINE BOW 53 



Genus QUERCUS Linnd 



Quercus viburnifolia Lesquereux 



(Plate 6, Figs. 3, 5, 7) 



Quercm mbumifolia Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 7, 1.59, pl. 20, fiK.s. 11, 12, 1878; U. S. Gcol. 

 and Geog. Surv. Terr., Ann. Rept. (1876), 50.5, 1878; Harvard Coll. Mus. Comp. Zoology Bull., vol. 16, 

 46, 1888; Knowlton, Washington Acad. Sci. Proc, vol. 11, 191, 207, 1909; U. S. Geol. Surv. Prof. Paper 

 130, 127, 1922; idem, Prof. Paper 155, .50, pl. 16, figs. 3-8, pl. 17, fig. 1, 1930. 



Alnus auraria Knowlton and Cockerell. Knowlton, U. S. Geol. Surv. Prof. Paper 155, 49, pl. 15, fig. 6, 1930. 



Beiula fallai Lesquereux (in part). Knowlton, ibid., 50, pl. 15, figs. 7-9, pl. 16, figs. 1, 2. 



Celastrus gaudini Lesquereux (in part). Knowlton, ibid., 99, pl. 45, fig. 9 (not figs. 3, 4). 



Fraxinus sp. Knowlton, ibid., 124, pl. 58, fig. 7. 



Populus denverensis Knowlton, ibid., 61, pl. 23, fig. 5. 



Quercus purdonensis Knowlton, ibid., 52, pl. 17, fig. 2. 



Quercus whHei Lesquereux. Knowlton, ibid., 53, pl. 17, fig. 3, pl. 18, fig. 1. 



Vibumum coniorlum Lesquereux?. Kjiowlton, ibid., 127, pl. 55, fig. 1. 



The long synonymy cited above illustrates clearly the prevalence of this type of leaf in the 

 Lance, Laramie, Black Buttes, Dawson, and Denver floras. The large number of "speoies" from 

 the Denver flora which arc here combined with Quercus viburnifolia might be open to criticism. 

 After studying the type specimens at the U. S. National Museum I find it impossible, however, to 

 segregate them into distinct species with truly recognizable differences. The alternatives were 

 either to merge them into a single species, whose leaves are somewhat variable — though no more 

 so than those of a single modern tree; or to separate the specimens into about 10 species based on 

 minor differences in shape, venation, or marginal characters. To avoid rather than produce con- 

 fusion, it was thought best to combine the specimens, incidentally adding greater value to the 

 species for correlation purposes. 



Specimens of this species were collected from 5 of the Medicine Bow localities. In none of 

 these is the species as abundantly represented as it is in the collections from the Denver formation. 

 Its presence in both the Laramie and Lance formations is reported in Professional Paper 130 cited 

 above, as well as in an unpubhshed manuscript of Knowlton's seen at the U. S. National Museum. 

 It is apparent that this species is not present in any of the extensive Fort Union or Eocene col- 

 lections at the Museum, nor has it ever been reported in beds either older or younger than post- 

 Montana Cretaceous. 



The generic reference of this species to Quercus seems open to question. I have coasulted 

 herbarium material of all genera of the Fagaceae and have not succeeded in finding any leaves of 

 comparable form. The general shape, venation, and character of marginal teeth of the fossil 

 leaves seem rather to relate them to the Betulaceae or the CaprifoHace£e. 



Occurrence — Corson Ranch, Wyoming, Loc. P. 372; north of Walcott, Wyoming, Loc. P. 

 373; Elk Mountain road, Wyoming, Loc. P. 374; Craig, (jolorado, Locs. P. 375, P. 376. 



Collection—\J. C. Mus. Pal., Plesiotypes Nos. 1316, 1317, 1318. 



Family MORACEiE 



Genus FICUS (Tournefort) Linn6 



Ficus planicostata Lesquereux 



(Plate 5, Figs. 3, 4, 5, 7) 



Ficus planicostata Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 393, 1873; Rept. U. S. 



Geol. Surv. Terr., vol. 7, 201, pl. 31, figs. 1-8, 10-12, 1878; Knowlton, U. S. Geol. Surv. BuU. 163, 52, 



pl. 10, fig. 4, pl. 12, figs. 2, 3 (not 4), 1900; Washington Acad. Sci. Proc, vol. 11, 211, 1909; Cockerell, 



Univ. Colorado Studies, vol. 7, 151, 1910; Ivnowlton, U. S. Geol. Surv. Prof. Paper 130, 131, 1922; idem, 



Prof. Paper 134, 82, pl. 9, fig. 2, 1924. 

 Ficus planicostata goldiarM Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1873), 399, 1874; 



Rept. U. S. Geol. Surv. Terr., vol. 7, 202, pl. 33, figs. 1-3, 1878; Ivnowlton, U. S. Geol. Surv. Prof. Paper 



155, 70, pl. 28, fig. 5, 1930. 

 Ficus planicostata cUnioni (Lesquereux) Knowlton, U. S. Geol. Surv. Bull. 152, 103, 1898; idem, Prof. Paper 



101, 303, pl. 76, fig. 3, 1917. 

 Ficus clinioni Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 393, 1873. 

 Ficus planicostata magnifolia Ivnowlton, U. S. Geol. Surv. Prof. Paper 130, 133, pl. 10, fig. 3, 1922. 

 Ficus leei Knowlton (in part), U. S. Geol. Surv. Prof. Paper 101, 261, pl. 39, figs. 2-5 only, 1917; idem, Prof. 



Paper 98, 338, pl. 90, fig. 2, 1917. 



