. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. THE EOCENE OF EUROPE AND NORTH AMERICA Ot West Indies and New South Wales. The sequoias are represented by Nordenskioldia. Among the northern trees are willows, oaks, and planer trees (Planera). III. MIDDLE AND UPPER EOCENE LIFE OF EUROPE AND AMERICA Near the close of the Lower Eocene the interchanges of mammalian life between the New and Old Worlds apparently ceased, and the mammals of the two great holarctic colonies entered upon a long period of independent and partly divergent evolution which lasted unti
. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. THE EOCENE OF EUROPE AND NORTH AMERICA Ot West Indies and New South Wales. The sequoias are represented by Nordenskioldia. Among the northern trees are willows, oaks, and planer trees (Planera). III. MIDDLE AND UPPER EOCENE LIFE OF EUROPE AND AMERICA Near the close of the Lower Eocene the interchanges of mammalian life between the New and Old Worlds apparently ceased, and the mammals of the two great holarctic colonies entered upon a long period of independent and partly divergent evolution which lasted until the summit of the Eocene,. MIDDLE EOCEINE: Fig. 46. — Middle Eocene. A period of continental depression, or geographic isolation of the New and Old World mammals, resulting in prolonged independent evolution and adaptive radiation on the great continents. Australia probably separated. The archaic and modern mammals giving rise to independent groups of mammals in (1) North America, (2) Eurasia, (3) North Africa, (4) South America. Rearranged after W. D. Matthew, 1908. as first pointed out by the Avriter in 1899 ^ and subsequently emphasized by Stehlin - and Matthew.^ Whereas in the Lower Eocene, owing to a contin- uance of the Basal Eocene community of life and to the invasion of similar modernized families, the two continents, that is, western Europe and the Rocky Mountain region, were united by the presence of nine families and ' Osborn, H. F., Tertiary Mammal Horizons of Europe and America, 1899-1900, p. 7 fol- * Stehlin, H. G., Sur Ics Mammif^res des Sables Bartoniens du Castrais. Bull. Soc. Geol. France, Ser. 4, Vol. IV, May, 1904, p. 47-3. ??'Matthew, W. D., Hypothetical Outlines of the Continents in Tertiary Times (p. 361). Bull. Amer. Mua. Nat. Hist., Vol. XXII, Art. xxi, Oct., 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 per
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