136 CONTRIBUTIONS TO PAL^ONTOLOGY 



Family MORACE.E 



Genus FICUS (Tournefort) Linn^ 

 Ficus planicostata Lesquereux 



Ficus ■planicoslata Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1872), 393, 1S73; 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; Proc. Wash. Acad. Sci., vol. 11, 211, 1909. Cockerell, Univ. 



Colorado Studies, vol. 7, 151, 1910. Knowlton, U. S. Geol. Suiv. Prof. Paper 130, 131, 1922; U. S. Geol. 



Surv. Prof. Paper 134, 82, pl. 9, fig. 2, 1924. Dorf, Carnegie Inst. Wash. Pub. No. 508, pt. I, 53, pl. 5, 



figs. 3-5, 7, 1938; BuU. Geol. Soc. Amer., vol. 51, 218, 222, 225, 1940. 

 Fitus planicostala goldiana Lesquereux, U. S. Geol. and Geog. Surv. Terr., Ann. Rept. (1873), 399, 1S74; 



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



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

 Ficus ptanicostata clintoni (Le.squereux) Knowlton, U. S. Geol. Surv. Bull. 152, 103, 1898; U. S. Geol. Surv. 



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

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

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

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



Surv. Prof. Paper 98, 338, pl. 90, fig. 2, 1916. 

 Ficus pseudopopulus Lesquereux (in part). Knowlton, U. S. Geol. Surv. Prof. Paper 101, 304, pl. 72, figs. 3, 4 



onlv. 1917; U. S. Geol. Surv. Prof. Paper 134, 83, pl. 7, fig. 4, pl. 9, fig. 3, 1924; U. S. Geol. Surv. Prof. 



Paper 155, 66, only pl. 25, figs. 3-5, 1930. 

 Ficus neoplanicostata Knowlton (in part), U. S. Geol. Surv. Prof. Paper 101, 303, pl. 73, fig. 4, pl. 74, figs. 2, 3, 



pl. 76, fig. 4, 1917; U. S. Geol. Surv. Prof. Paper 134, 82, pl. 9, fig. 4, 1924; U. S. Geol. Surv. Prof. Paper 



155, 69, only pl. 28, figs. 3-7, 1930. 

 Ficus prs-latifolia Knowlton, U. S. Geol. Surv. Prof. Paper 98, 338, pl. 87, fig. 4, 1916. 

 Pterospermites ruomexicanus Knowlton, U. S. Geol. Surv. Prof. Paper 98, 341, pl. 90, fig. 6, 1916. 

 Ficus impressa Knowlton, U. S. Geol. Surv. Prof. Paper 130, 134, pl. 7, figs. 1-3, pl. 16, fig. 3, 1922. 



There are onlj' 5 .specimens in the collections which are referable to this well-defined leaf 

 type. This is in marked contrast with its abundance in the Black Buttes, Laramie, and Medicine 

 Bow floras. 



A detailed discussion of this species has already been given in my report on the Medicine 

 Bow fiora, cited above. On the basis of present knowledge, it is apparent that the Lance Creek 

 area was near the northern limit of the range of this species, since it is not known to occur in the 

 Hell Creek flora of similar age in Montana and the Dakotas, or in the equivalent Whitemud fiora 

 of Saskatchevvan. 



Occurrence — Locality P3853. 



Collection—l!. C. Mus. Pal., No. 2502. 



Family PLATANACE^ 



Genus PLATANOPHYLLUM Fontaine 



Platanophylluni montanum (Brown) Dorf, n. comb. 



(Plate9, Figs. 1,4) 



Sassafras montana Brown, U. S. Geol. Surv. Prof. Paper 189, 250, pl. 52, fig. 4, pl. 55, fig. 4b, 1939. Dorf, 



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

 Sassafras sp., Knowlton, Proc. Washington Acad. Sci., vol. 11, 207, 1909. 

 Aralia sp., Knowlton, Proc. Washington Acad. Sci., vol. 11, 207, 1909. 



This vvell-defined lcaf form is the dominant among the specimens collected at Locality P3854. 

 More than 75 specimens were obtained for study. None of these is preserved in its entirety, owing 

 to the conchoidal and fractured nature of the matrix. A sufBcient numbcr of fairly complete 

 specimens vvere secured, however, to shovv the essential details of shape, size, margin, and venation. 



Sassafras montana vvas described by Brown for specimens from the Hell Creek formation of 

 Montana, as follows: 



"Leaves 8 centimeters or more vvide, three-Iobed, the lobes relatively short, i)luiit-rouiided; 

 sinuses narrovv, rounded; base cuneate; petiole 5 centimeters long. The lateral primary veins 

 depart from the midrib 0.5 centimeter above the top of the petiole, aiid after ruiining a fairly 

 straight course pass into the tvvo lateral lobes. The secondary venation is camptodrome." 



