LANCE FLORA OF EASTERN WYOMING 115 



There is no alternative but to conclude that at least a part of the Vermejo 

 deposits are of Lancian age. This at once suggests that it may be possible to show 

 that the tj^pical Lancian species occur only in the upper part of the Vermejo forma- 

 tion. The stratigraphic position of some of the plant horizons in the Vermejo 

 formation has not been recorded. It is clear, however, that of the 14 species Hsted 

 above, the stratigraphic positions of 11 are known: all the 11 are in the upper Ver- 

 mejo and only 3 {Artocarpus dissecta, Cissites panduratus, and Palxoaster inquirenda) 

 are reported also in beds which are questionably in the lower Vermejo. I beheve 

 it just as significant to point out that the majority of the restricted Lancian species 

 listed above as occurring in the Vermejo are known elsewhere only in beds of lower 

 rather than upper Lancian age. 



With respect to the restricted Montanan and pre-Montanan species present 

 in the Vermejo fiora, it is difficult to determine whether these are rehcts in a fiora 

 of early Lancian age or are actually indicative of Montanan age for the lower part 

 of the formation. These species are as foUows: 



Brachyphyllum cf. B. macrocarpum Liriodendron alatum 



Ficus regularis Pterospermites undulatus 



Ficus rhamnoides Pterospermites wardii 



Ficus? starkvillensis Widdringtonia? complanata 

 Ficus wardii 



Disregarding Liriodendron alatum, whose stratigraphic position in the Vermejo 

 formation is very much in doubt, 3 species (Ficus regularis, Ficus rhaynnoides, and 

 Brachyphyllum cf. B. macrocarpum) are confined to the lower Vermejo, 2 species 

 (Pterospermites wardii and Widdringtonia? complanata) are confined to the upper 

 Vermejo, and the remaining 3 are known in both the lower and the upper Vermejo. 

 This leads me to the conclusion that the lower Vermejo is of latest Montanan age, 

 as shown in figure 3, and that the upper Vermejo is of early Lancian age, during 

 which time a few Montanan species survived as rehcts. 



The Raton flora is a large fiora of about 135 species which is Paleocene in general 

 aspect. It contains, however, an element (20 out of a total of about 70 species with 

 outside distribution) which is elsewhere restricted to Lancian age or older. This 

 element includes the following species, of which those marked by an asterisk are 

 definitely known only from the Raton and the Triceratops-hesiTmg Arapahoe-Denver 

 or lower Dawson : 



Allantodiopsis erosa Ficus planicostata 



Anona? robusta Ficus? trinervis 



*Artocarpus similis *Geonomites tenuirachis 

 *Castanea intermedia? Nekimbo tenuifolia 



Cinnamomum linifolium Palaeoaster inquirenda 



*Cissus coloradensis *Paloreodoxites plicatus 



*Cissus grosse-dentata *PIatanus rhomboidea 

 Cornophylkim wardii Pteris russclH 



Dryophyllum subfalcatum Sabalites eocenica 



*Ficus aquilar Viburnum marginatum 



It has been possible to determine, from the report of Lee and Knowlton,' the 

 approximate position in the Raton formation of all but 4 of the species listed. Of 



> Lee, W. T., and Knowlton, F. H., op. cit., 66-161, 1917. 



