116 CONTRIBUTIONS TO PAL^ONTOLOGY 



the total of 18 species, 13 are known onlj^ from the lower 500 feet of the Raton, 2 

 (Artocarpus similis and Ficus planicostata) are known from both the lower and the 

 uppcr Raton, and only 2 {Cornophijllum wardii and Platanus rhomboidea) are 

 known only from the middle or uppcr Raton. These facts seem to me to indicate 

 that a part of thc lower Raton formation is of Lancian age, specifically upper Lan- 

 cian age, corrcsponding to the Trjcera^ops-bearing beds of the Arapahoe-lower Den- 

 ver and the lower Dawson. 



Whitemud-lower Ravenscrag floras — The Whitemud formation of southern 

 Saskatchewan has yielded a flora of 26 species, described by Berry.^ Omitting 4 

 species which Berry says are only questionably determined, the analysis of this 

 flora is as f oUows : 



No outside distribution 4 



Outside distribution 18 (8 in common with type Lance) 



Total number of species 22 



Short-ranging species: Long-ranging species: Species of uncertain range . . 4 



Montanan Montanan-Lancian-Palcocene . . 3 



Lancian 5 Montanan-Lancian 4 



Paleocene 1 Lancian-Paleocene 1 



6 8 



Out of a total of 18 species with outside distribution, 8 (44 per cent) are also 

 found in the tj^De Lance flora. This percentage is somewhat lower than that seen 

 in typical Lancian floras, and is of the same order as in the Vermejo flora, of late 

 Montanan and early Lancian age. Yet in the appraisal of the short-ranging species 

 it is noted that no Whitemud species are restricted elsewhere to Montanan age, 6 

 are restricted to Lancian age, and 1 is restricted to the Paleocene. These are as 

 follows : 



Restrirtcd clsewherc to Lancian age: 



Leguminosites arachioides minor \'iburnum marginatum 



NeKimbo tenuifolia Zizyphus coloradensis 



Smilax? inquircnda 



Restricted elsewhere to Paleocene age: 

 Viburnum antiquum 



The overwhelming preponderance of restricted Lancian species in the White- 

 mud should cast suspicion on the idcntification of the single restricted Paleocene 

 species, which is not figured in Berry's report. The conclusion from the analysis is 

 definitely that the Whitemud flora is of Lancian agc. From occurrcnccs of its 

 species elsewhere its asscmblagc seems also to bc carl}- rathcr than latc Lancian. 



The flora of the lower Ravcnscrag formation of southcrn Saskatchewan com- 

 prises only 9 species, of which 2 are of doubtful vaUdity.- Of 6 specics with outside 

 distribution, 2 {Ficusl ceratops and Fraxinus leii) are restrictcd to Lancian age, 2 

 {Ginkgo adiantoides and Dillenites clehurni) arc morc abundant in Lancian floras 

 than in the Palcocene, and 1 (^4ra/ia notata) is known elsewhere only in the Paleo- 



' Berry. E. W., Canada Geol. Surv. Mem. 182, 3-4, 1935. 

 » Ibid., 4. 



