{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T08:14:06Z","timestamp":1768292046175,"version":"3.49.0"},"reference-count":19,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"3879","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Science"],"published-print":{"date-parts":[[1969,5,2]]},"abstract":"<jats:p>\n            A lower jaw of an eohippus (\n            <jats:italic>Hyracotherium<\/jats:italic>\n            cf.\n            <jats:italic>H. angustidens<\/jats:italic>\n            ) from late Paleocene strata in Wyoming has extended the geological record of fossil horses into pre-Eocene time and suggests that the order Perissodactyla had an origin earlier than that heretofore conjectured. This specimen, together with equid teeth also possibly of late Paleocene age from Baja California, indicates that early perissodactyls were widespread on the North American continent before the Eocene epoch. Late Paleocene and early Eocene deposits of northwestern Wyoming have yielded many vertebrate rarities and \"first or earliest occurrences\" which require reappraisals of inter-and intracontinental dispersal patterns of the vertebrate groups involved.\n          <\/jats:p>","DOI":"10.1126\/science.164.3879.543","type":"journal-article","created":{"date-parts":[[2006,10,5]],"date-time":"2006-10-05T12:14:21Z","timestamp":1160050461000},"page":"543-547","source":"Crossref","is-referenced-by-count":16,"title":["Paleocene Hyracothere from Polecat Bench Formation, Wyoming"],"prefix":"10.1126","volume":"164","author":[{"given":"Glenn L.","family":"Jepsen","sequence":"first","affiliation":[{"name":"Department of Geological and Geophysical Sciences, Princeton University, Princeton, New Jersey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael O.","family":"Woodburne","sequence":"additional","affiliation":[{"name":"Department of Geological Sciences, University of California, Riverside"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"221","reference":[{"key":"e_1_2_1_1_1","unstructured":"Andrews D. 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J. A new early tertiary perissodactyl hyracotherium seekinsi from Baja California LOS ANGELES COUNTY MUSEUM OF NATURAL HISTORY CONTRIBUTIONS IN SCIENCE 151 (1968).","DOI":"10.5962\/p.241139"},{"key":"e_1_2_1_13_1","unstructured":"Pierce W. G. Geologic Map of the Clark Quadrangle Park County Wyoming (1965)."},{"key":"e_1_2_1_14_1","unstructured":"RADINSKY L.A. 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