. Cenozoic mammal horizons of western North America. Mammals, Fossil; Paleontology; Paleontology; Paleontology; Mammals, Fossil. 62 CEXOZOIC MAMMAL HOKIZONS MIDDLE OLIGOCEXE (EUROPE. ETAGE ST.\:^1PIEX [TOXGRIEX SUPERIEUR]). 9. LOWER PART OF BRULE CLAY (DARTON : OREODON ZONE AND 'METAMY- NODON ; (Figs. 1, 9, 10; Pb. I-III.) HOMOTAXIS AXD SYXOXYMT. North America.—1. Horizons B and C of Hayden and Leidy. 2, Oreodon zone of Leidy. 3, Lower Brule clay of Dart ; 4, " JHeta- mynodon sandstones" of Wortman.^ (1-4 all of South Dakota.) 5, 'Tedar Creek beds'" of Ma
. Cenozoic mammal horizons of western North America. Mammals, Fossil; Paleontology; Paleontology; Paleontology; Mammals, Fossil. 62 CEXOZOIC MAMMAL HOKIZONS MIDDLE OLIGOCEXE (EUROPE. ETAGE ST.\:^1PIEX [TOXGRIEX SUPERIEUR]). 9. LOWER PART OF BRULE CLAY (DARTON : OREODON ZONE AND 'METAMY- NODON ; (Figs. 1, 9, 10; Pb. I-III.) HOMOTAXIS AXD SYXOXYMT. North America.—1. Horizons B and C of Hayden and Leidy. 2, Oreodon zone of Leidy. 3, Lower Brule clay of Dart ; 4, " JHeta- mynodon sandstones" of Wortman.^ (1-4 all of South Dakota.) 5, 'Tedar Creek beds'" of Matthew.^ northeastern Colorado. 6, "Wide- spread similar exposures in southeastern Wyoming, South Dakota, and northwestern Nebraska. 7, Scattered exposures in western Montana. Europe.—Approximate homotaxis ^-ith the Stampien or Ohgocene moyen of Europe is indicated b}' similar stages in the evolution of Artiodactyla-Anthracotheriidae {Hyopotamus), of Perissodactyla- Amynodontid^e (e. g., Metamy- nodon, CadurcotTierium), of Tapi- rida^, of Rliinocerotida?, and of Chalicotheriid^e. Also by the apparent disappearance in both countries of Perissodactyla- Amynodontidse and Creodonta- Hyjenodontid^e in the upper Oreodon zone. FAUXA.*^ The rich mammalian fauna (more than 48 species being known in the big badlands of South Dakota alone) is distinguished negatively by the absence of Titanotlierium and positively by the presence of abundant oreodonts. The important distinction was first made by Matthew ^ that the Brule clay, or Oreodon zone, of fine, still-water or eohan composition, a Dart on, N H., Preliminary report on the geology and undei^ound-water resources of the central Great Plains: Prof Paper U. S Geol Survey No. 32, 1905. b Wortman, J L , On the divisions of the White River or lower Miocene of Dakota: Bull. Am. Mus. Nat. Hist , vol. 5, 1S93. pp. 95-105. Osbom, H. F . and Wortman, J L , Fossil mammals of the lower Miocene White River beds: Bull. Am. Mus. Nat. Hist , vo
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