page_title: Bridger Formation
hierarchical_section_title: Bridger Formation
caption_attribution_description: English: Title: The age of mammals in Europe, Asia and North America Identifier: ageofmammalsineu00osbo (find matches) Year: 1910 (1910s) Authors: Osborn, Henry Fairfield, 1857-1935 Subjects: Mammals, Fossil; Paleontology Publisher: New York, The Macmillan Company Contributing Library: Smithsonian Libraries Digitizing Sponsor: Smithsonian Libraries View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: 156 THE AGE OF MAMMALS tomorphidae, Notharctidae), both surviving from the Lower Eocene. The pro-Carnivora (Miacidae) also survive from the Lower Eocene, and be- come more diversified than in the Wind River, although most of the genera are modified Lower Eocene forms. The Rodentia still are limited to the rather generalized Ischyromyidae, also surviving from the Lower Eocene and becoming diversified into six genera, which may prove to represent more than one family. At the very summit of the Eocene the American rodents known as jumping mice, or Dipodidae, are doubtfully represented in the genus Protoptychus. Among the modern ungu- lates, as in Europe, this is the grand epoch of the Peris- sodactyla. Of these, two families only (Equidae and Lophiodontidae) have relatives in Europe. Of the re- maining families, the tapirs (Tapiridae), titanotheres (Titanotheriidae), two families of rhinoceroses (Hyraco- dontidae, Amynodontidae), cursorial, aquatic, or amphib- ious respectively, appear to be peculiar to North America. The even-toed ungulates, or Artiodactyla, are far less diversified than in Europe. They include the bunodont and omnivorous Achaenodontinae (Achcenodon), related to the entelodonts Characteristic Mammals Uintatheres Horses Tapirs Rhinoceroses Titanotheres Lophiodonts Entelodonts Homacodonts Oreodonts Camelids Taeniodonts Tillodonts Insectivores Lemuroids Armadillos Text Appearing After Image: Fig. 57. —In tlic li,.:irt &lt;,l'th.'Middle Eocene, Bndgcr liadl;uid.s &lt;il W \ nimnt^, ii. tli.'fani.nis locality known as Grizzly Buttes. Zone of Orohippus and Palwosyops. Photograph by American Museum of Natural History, 1903. Note About Images 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 perfectly resemble the original work.
context_page_description: The Bridger Formation is a geologic formation in southwestern Wyoming. It preserves fossils dating back to the Ypresian Epoch of the Paleogene Period. The formation was named by American geologist Ferdinand Vandeveer Hayden for Fort Bridger, which had itself been named for mountain man Jim Bridger. The Bridger Wilderness covers much of the Bridger Formation's area.
context_section_description: The Bridger Formation is a geologic formation in southwestern Wyoming. It preserves fossils dating back to the Ypresian Epoch of the Paleogene Period. The formation was named by American geologist Ferdinand Vandeveer Hayden for Fort Bridger, which had itself been named for mountain man Jim Bridger. The Bridger Wilderness covers much of the Bridger Formation's area.
caption: Grizzly Buttes, a major feature of the Bridger Formation
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