Periods. Floras and sub-floras. References. --------------+---------------------------+----------------------------- Transition Upper Laramie or Porcupine { Platanus beds of Souris Eocene to Hill. Fort Union { River and Calgary. Report Cretaceous. group, U. S. territory. { of Geol. Survey of Canada { for 1879, and Memoir of { 1885. --------------+---------------------------+----------------------------- Middle Laramie or Willow Creek beds. { Lemna and Pistia beds of Lower Laramie or St. { bad lands of 49th parallel, Mary River. { Red Deer River, &c., with Upper { lignites. Report 49th Cretaceous { Parallel and Memoir of { 1885. (Danian and Senonian). Fox Hill series Marine. Fort Pierre series Marine. { Sequoia and Brasenia beds Belly River { of S. Saskatchewan, Belly { River, &c. with lignites. { Memoir of 1885. Coal measures of Nanaimo, { Memoir of 1883. Many B.C., probably here. { dicotyledons, palms, &c. --------------+---------------------------+----------------------------- Middle Dunvegan series of Peace } Cretaceous River. Dakota group, } Memoir of 1883. Many (Turonian and U. S. Amboy clays, } dicotyledons, cycads, &c. Cenomanian). U. S. } Mill Creek beds of Rocky { Dicotyledonous leaves, Mountains. { similar to Dakota group of { the U. S. Memoir of 1885. --------------+---------------------------+----------------------------- Lower Suskwa River beds and } Cretaceous Queen Charlotte Island } Cycads, pines, a few (Neocomian. coal series. Intermediate } dicotyledons. Report Geol. &c). beds of Rocky } Survey. Memoir of 1885. Mountains. Potomac } series of Virginia. } Kootanie series of Rocky { Cycads, pines, and ferns. Mountains. { Memoir of 1885. --------------+---------------------------+------------------------------ CHAPTER VI. THE REIGN OF ANGIOSPERMS IN THE LATER CRETACEOUS AND KAINOZOIC. [Illustration: Fig. 68.--_Populus primæva_, Heer. Cretaceous, of Greenland. One of the oldest known Angiosperms.]