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Ray 1985. Status of studies on fossil marine mammals. Marine Mammal Science 1:15-53. Makah Formation a deep-marginal-basin sequence of Late Eocene and Oligocene age in the northwestern Olympic Peninsula. Washington. United States Geological Survey Professional Paper 1162-B. 1 , , New Enaliarctos* (Pinnipedimorphai from the Oligocene and Miocene of Oregon and the role of "enaliarctids" in pinniped phylogeny. Smithsonian Contributions to Paleobiology 69. Berta, A. 1991. R. L. Carroll. Freeman, 1988.
The neural spine is thin, wider only at the rectus capitis origin. Its form most approximates that of phocids orly, which the spine is more robust and has a marked posterior process. The postzygapophyses lack dorsal processes for insertion of the axial muscles, but the base rather than that of otariids or ursids, in It has a less highly arched palate, a shorter paroccipital process, a smaller hyoid fossa, and a smaller infraorbital foramen. Also, the jugal rims the anteroventral part of the orbit.
Third metatarsal, but without the proximal end this identification is uncertain. The shaft of this bone is markedly flattened dorsoventrally. as in ' pinnipeds. articulation Enough remains of the distal end to indicate that the was hemispherical and had a well-developed ventral The median phalanx is also markedly keel, as in terrestrial carnivores. flattened but not elongated as in pinnipeds or Enhydra. Its distal end is trochleated. and the proximal articulation indicates that the distal the proximal phalanx was also trochleated.