CEXOZOIC MAMMAL HORIZONS 



taxis of the American horizons " Nebraska," ''Clarendon beds," 

 "Santa Fe marls/" and ''Madison Valley beds'' is singularly well 

 established. 



Among Rodentia-MylagauHdae, 1 genus. Among Sciuridae, 2 gen- 

 era. Among Camivora-Canid^e, ^lurodon, CynodesmusC^.), Boro- 

 fhagus, Dinocyon{/) , and Ischyrocyon. Among Mustelidse, Mustela, 

 Lutra, Potnmoihenum, Bradiypsalis, Putorius. Among Felidse, Pseu- 

 dsdurus {Fells of Leidy), and large machaerodonts of uncertain genus. 

 Among Procyonidge, Leptarctus. Among Perissodactyla, 3 families: 

 (a) among Equidse (5 genera), ProtoMppu^ (5 or more species), Xeo- 

 Tiipparion (5-12 species) ^^'ith long crowned teeth, Mer-ycJiippus per- 

 sisting with, intermediate teeth, Hypohippus and Parahippus (Mon- 

 tana) persisting with short -cro^^^led teeth; (b) among Rliinocerotidae- 

 Teleoceiinse, 2 genera of the short -limbed type occur — Teleoceras, 

 Pemceras, £dso Aphelops cemtorJdnus; (c) among Tapirid^e, Tapiravus. 

 Among Artiodactyla, 5 famihes: (a) Camehdae, including PJiaucJie- 

 nia (its first appearance, 2 or more species), Procamelus (its first 

 appearance, 2-7 species) ; (b) among Oreodontidae, Merycodiarus (2 

 species, Montana), Merychyus, Pronomotlierium; (c) among Meiyco- 

 dontinse, Mer-ycodus; (d) among Dicotyhdae, ProstJiennops (Montana) ; 

 (e) among Cervidae, Palseomeryx (5 species), BJastomeryx. Among 

 Proboscidea there occur the long-jawed types analogous to Ttilo- 

 phodon angustidens of Europe. 



LA^ST PHASE OF MIOCEXE OR FIRST PHASE OF PLIOCEXE (EUROPE, 

 ETAGES POXTIEX. MESSIXIEXi. 



A late phase of Miocene, or early phase of Pliocene, is the deposit 

 on Republican River, in northern Kansas. It Ls, provisionally and 

 subject to further exploration, distinguished (Matthew) from the 

 so-called "Loup Fork, " or '' Nebraska, " of Scott. Its fauna presents 

 certain parallels vdth the Pikermi and Eppelsheim fauna (placed by 

 Deperet in the upper Miocene) of Europe, even if not of more recent 

 age. It is widely separate from a second and much later phase, rep- 

 resented in the Blanco formation of northwestern Texas, which is 

 much more recent in its fauna and is here regarded as middle Pliocene. 



16. OGALALLA FORMATION IN PART : PERACERAS ZONE. 



(Fig-. 1. 10: PI. I. ) 

 HOMOTAXIS. 



America. — 1, Upper "Loup Fork" (100 feet) of Republican River, 

 northwestern Kansas. 2, Ogalalla formation (tvpical), Dart on, of 

 southwestern Nebraska. 3, "Archer formation of Florida (in part). 

 4, Rattlesnake formation of John Day Valley, Oregon. 



Europe. — Pontien: Eppelsheim, in northern Europe; Pikermi, in 

 Greece; Mont Leberon, Vaucluse, France. 



