The Clarkforkian Land-mammal Age and Mammalian Faunal Composition Across the Paleocene-Eocene Boundary

AMNH Apheliscus assemblages atavus Bear Creek beds Bighorn Basin boundary Clark's Fork Basin Clarkfork Clarkforkian Clarkforkian age Clarkforkian specimens collection CONDYLARTHRA Coryphodon cusp dentary Didymictis Dipsalodon Dissacus diversity dubius early Clarkforkian early Eocene early Wasatchian Ectocion osbornianus Eocene Esthonyx excavatus Family Figure forkian fossil Gazin genus Gingerich Granger Haplomylus holotype Hyopsodontidae Ignacius incisor includes isolated teeth Jepsen known larger late Paleocene late Tiffanian left dentary locality lower M₁ M₂ M₂L Mammalian faunal composition mammals Matthew McKenna MESONYCHIA metaconid Miacidae morphology nitidus Order Oxyaena oxyaenid pagei Palaeonictis Palaeosinopa Paleocene PANTODONTA paraconid Paramys Paromomyidae Peradectes Phenacodontidae Phenacodus Phenacodus-Ectocion Phenacodus-Ectocion Phenacodus-Ectocion Zone Phenacolemur Plagiomene Plesiadapis cookei Zone Polecat Bench Formation Pontifactor praecursor Princeton Quarry Probathyopsis Referred Specimens.-UM relatively right dentary sample Sand Coulee Simpson slightly smaller species richness stratigraphic Table talonid taxa Taxon Thryptacodon tooth Torrejonian Total/MNI transiens trigonid Uintacyon Valen Viverravus vortmani Willwood Formation Worlandia Wyoming