48 
a part of the thick scale-covered basal shoot. None of the specimens is 
complete and they do not agree exactly with one another or with previously 
described forms, although they might readily represent Czekanowskia 
dichotoma Heer from the Kome Cretaceous of Greenland. Czekanowskia 
nervosa Heer was identified by Fontaine 1 from the Lakota formation of the 
Black Hills of Wyoming, but the material suggests the genus Baiera to me 
although it may be the same as my figure 3 from locality CK1. 
In the present species the leaves are narrow, linear, and fasciculate 
from a short, thick, scale-covered shoot. In the Kootenay material from 
the first locality they are simple for a long distance not forking several 
centimetres above their base. Specimens from a second locality (OKI) 
are somewhat stouter and show repeated dichotomous forking. A midrib 
is usually visible together with subordinate veins parallel with it near the 
margins. The leaves are of considerable consistency, and the stomata 
of several Jurassic species have been described by Nathorst and Seward. 
The genus is rather widespread in the Middle Jurassic and Lower 
Cretaceous. Heer referred it to the Ginkgoales from its resemblance in 
habit to Baiera, and the character of the stomata lends some support to 
this view. Jeffrey suggested an Araucarian relationship for Czekanowskia, 
but there appears to be no basis for such an opinion. Although the short 
shoots suggest Pinus, the dichotomous habit of the leaves negatives such a 
relationship, and although it cannot be considered to be settled the present 
status of the evidence points to the botanical affinity suggested by the 
author of the genus. 
Occurrence. Kootenay; localities COl, CK1, and CQ3. 
Genus, ginkgo Linnaeus 
Ginkgo arctica Heer 
Plate VII, figure 6 
Ginkgo arctica Heer, Flora Fossilis Arctica, Bd. 3, ab. 2, p. 37, PL 3, fig. 3 
(1874): Idem., Bd. 6, ab. 2, p. 14 (1882). 
Ginkgo siMrica Dawson (non Heer), Trans. Roy. Soc., Canada, vol. 3, 
sec. 4, p. 8, PL 2, fig. 1 (1885). 
Knowlton (non Heer), Smith. Misc. Coll., vol. 4, pt. 1, p. 124, Pl. 13, 
figs. 1-4; PL 14, figs. 1, 2 (1907). 
Baiera brevifolia Newberry, Am. Jour. Sci., vol. 41, p. 199, Pl. 14, fig. 3 
(1891). 
Baiera grandis Heer, op. cit., p. 37, PL 3, fig. 4 (1874) : Idem., p. 10 (1882) 
(non Hollick, 1907). 
Leaves of Ginkgo are notably variable, the specimen figured being a 
rather large variant, and this Lower Cretaceous form has frequently been 
confused with the Jurassic Ginkgo sibirica Heer, a similarly variable but 
generally distinguishable species. The present species is common in the 
Kootenay of Alberta and occurs more sparingly in the Lower Blairmore. 
It was originally described from material from the Kome beds of western 
Greenland and was subsequently recorded from the Kootenay of British 
i Fontaine, W. M., in Ward, L. F.: 19th Ann. Kept. U.S. Geol. Surv., pt. 2, p. 685, Pl. 169, figs. 1, 2 (1899). 
