57 
Cretaceous, which appears to be the exact situation in the Blairmore 
formation of Alberta. I regard the Upper Blairmore flora as unquestion- 
ably of Upper Cretaceous age, but somewhat older than the true Dakota 
sandstone. Perhaps this conclusion may be better understood in terms 
of the standard European section, according to which standard the upper 
part of the Blairmore formation would be Cenomanian in age, as is also 
the Cheyenne sandstone of southern Kansas, and the true Dakota would 
be Turonian in age and represent the transgressing littoral of the Benton 
sea. 
Table of Distribution 
Fteridophyta 
Asplenium dicksonianwn Heer Lower to tipper Cretaceous, characteristic 
of late Lower and early Upper Cre- 
taceous 
Cladophlebis cdbertsii (Heer) Atane beds of Greenland (not older 
records) 
Cycadophyta 
Pseudocycas unjiga (Dawson) Dunvegan and Dakota sandstones 
Podozamites latipennis Heer Atane beds of Greenland. Recorded from 
the Kootenay 
Podozamites stenopus Lesquereux Dakota sandstone 
Coniferophyta 
Geinitzia jenneyi Ward (?) Fuson formation of the Black Hills 
Sequoia condita Lesquereux (?) Cheyenne sandstone of Kansas 
Pinus susqicaensis Dawson Kootenay, Lakota, and Fuson formations 
Angiospermophyta 
Populus cf . berggreni Heer Atane beds of Greenland 
Ficus ovatifolia Berry (?) Raritan formation and later 
Magnolia altemans Heer (?) Atane., Raritan, and Dakota formations 
Menispemiites reniformis Dawson (?) Coal Creek, British Columbia 
Daphnophyllum dakotense Lesquereux Dakota sandstone (?) 
Sassafras mudgii Lesquereux (?) Cheyenne sandstone (doubtful in the 
Dakota) 
Paliurus ovalis Dawson (?).., Raritan, Mill Creek, British Columbia 
Sapindopsis magnifolia Fontaine Patapsco, Cheyenne, Dakota formations 
Sapindopsis belviderensis Berry (?) Cheyenne sandstone 
Pteridophyta 
Genus, asplenium Linnaeus 
Asplenium dicksonianum Heer 
Asplenium dicksonianum Heer, Flora Fossilis Arctica, vol. 3, ab. 2, p. 31, 
PL 1, figs. 1-5 (1874); Idem., vol. 6, ab. 2, pp. 3, 33, Pl. 2, fig. 2; 
Pl. 32, figs. 1-8 (1882). 
Dawson, Trans. Boy. Soe., Canada, vol. 1, sec. 4, p. 11 (1883); Idem., 
vol. 3, sec. 4, p. 5, Pl. 3, fig. 1 (1885); Geol. Surv., Canada, Ann. 
Rept., N.S., vol. 1, p. 76 (1886) ; Idem., vol. 10, sec. 4, p. 91 (1892). 
Lesquereux, FL Dakota Group, p. 24, Pl. 1, fig. 1 (1892). 
Newberry, Flora of Amboy Clays, p. 39, Pl. 1, figs. 6, 7; PL 2, figs. 1-8; 
PL 3, fig. 3 (1896). 
Ward, 19th Ann. Rept. U.S. Geol. Surv., pt. 2, p. 704, fig. 1 (1899). 
Fontaine, in Ward, Idem., p. 664, PL 162, figs. 6-8 (not Fontaine) 1888. 
Berry, U.S. Geol. Surv., Prof. Paper 129, p. 207 (1922). 
