MESOZOIC TIISIE — CRETACEOUS. 



833 



the western border of South Dakota, in beds that are shown by Ward to be 

 Lower Cretaceous, though formerly referred to the Dakota group. 



The flora of the Kootanie beds, in British America, described by Dawson, 

 includes no Angiosperms ; but the identity of other species with some of 

 those of the Potomac group is regarded as sufficient evidence of equivalency. 

 Some of the kinds are here represented. Fig. 1354, Sequoia Smittiana of 

 Heer, common in the Greenland beds ; 1355, Salisburia Sibirica, a species 

 described by Heer from the Lower Cretaceous of Greenland ; and 1356, the 

 Cycad, Podozamites lanceolatus Lindley, a species that is found also in Siberia, 

 Sweden, India, and China, and appeared first in the Jurassic. The same species 

 occur in the Kootanie beds of Montana, as first observed by Newberry. 

 Cretaceous plants from Cape Lisburne, Alaska, were referred by Lesquereux, 

 in 1888, to the Neocomian. The number of species thus far described from 

 the region is 60 (Knowlton). The Kome beds of Greenland afforded Heer 

 species of Ferns, Cycads, Conifers, a few Endogens, and but one Angiosperm, 

 Populus primceva. 



The plants of the Kootanie beds include, according to Dawson, besides those of 

 Figs. 1354-1356, Dioonites borealis Dawson, Zamites Montana Daws., Z. acutipennis 



1354-1356. 



1355 



KooTAUiE Plants. — Cobtifees. — Fig. 1354, Sequoia Smittiana ; 1355, Salisburia Sibirica. Ctoad. — Fig. 1356, 



Podozamites lanceolatus. J. W. Dawson. 



Heer, Salisburia nana Daws., Baiera longifulia Heer, Glyptostrobus Groe7ilandicus 

 Heer, Taxodium cuneatum Newberry. (Heer's species are all Greenland species.) From 

 Dana's manual — 53 



