. The geological history of plants. Paleobotany; 1888. LATKR CRETACBOtrs AND KAIXOZOIG. 207 of a woodland streamlet, and have fonnd tfaem stored with the fallen leaves of trees, but it was in Tain to search for the leaves of herbaceous plants. The rJimate of North America and Eniope, represented by the Cenomanian Tegetation, is not tropical bnt warm temperate ; bnt the flora was more uniform than at pres- ent, indicating a very equable climate and the possibility of temperate genera existing within the Arctic circle, and it would seem to have become warmer toward the close of the period. The f
. The geological history of plants. Paleobotany; 1888. LATKR CRETACBOtrs AND KAIXOZOIG. 207 of a woodland streamlet, and have fonnd tfaem stored with the fallen leaves of trees, but it was in Tain to search for the leaves of herbaceous plants. The rJimate of North America and Eniope, represented by the Cenomanian Tegetation, is not tropical bnt warm temperate ; bnt the flora was more uniform than at pres- ent, indicating a very equable climate and the possibility of temperate genera existing within the Arctic circle, and it would seem to have become warmer toward the close of the period. The flora of the Cenomanian is separated in most countries from that of the Senonian, or uppermost Cre- taceous, by a marine formation holding few plants. This depends on great movements of elevation and depression, to which we must refer in the sequel. In a few regions, however, as in the vicinity of the Peace Biver in Canada, there are plant-b^uring beds which serve to bridge over the interval between the Early Cenomanian and tiie later Cretaceous.* To this interval also would seem to belong the Belly River series of west«m Canada, which contains important beds of coal, but is closely as- sociated with the marine Fort Kerre series. A very curious herbaceous plant of this group, which I have named Brasenia an- tiqua^ occurs in the beds associated with one of the coals. It is a close ally of the modem B. peUata, an aquatic plant which occnrs in British Columbia and in eastern. Fie. 76.—Bntenia anUftia. Vjuper Cre- t»c«ous. South Saskatdnirmn fiirbr. Katural sixe. a, 6, Diagrams of vena- fion, sli^tly eiduged. * See paper by die aothor in the " TransacticHis of the Kojal Sodety of Canada," Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, John William, Sir, 1820-1899. New York, D. Apple
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