Tertiary mammalian faunas of the Mohave desert

 
9781130335668: Tertiary mammalian faunas of the Mohave desert
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ... Protohippus, but better material might indicate its affinity with Pliohippus. This specimen was associated with the type specimen of M. intermontanus from locality 1401 in the Barstow syncline. The characters of this tooth are near those of M. intermontanus, but it differs from that form in greater width and its much more compressed and anteriorly longer protocone. The form represented by no. 21423 (figs. 80, 81) may be a species distinct from M. intermontanus or may be a more advanced stage of 80 Figs. 80 and 81. Protohippus? or Pliohippus?, sp. Superior cheek-tooth, no. 21423. Fig. 80, outer view; fig. 81, occlusal view. Barstow Miocene, Mohave Desert, California. Fig. 82. Protohippus or Pliohippus?, sp. Superior cheek-tooth, no. 21424, natural size. Barstow Miocene, Mohave Desert, California. that species. Specimen no. 21423 represents the maximum of advance of the Equidae in the Barstow fauna. It differs from all three of the Pliohippus forms of the Ricardo. It is smaller, and less advanced than Pliohippus fairbanksi. It differs from P. tantalus in the smaller fossettes, and is also somewhat smaller and apparently less advanced. A single tooth from the Ricardo, representing a form near Pliohippus mirabilis is smaller in cross-section than no. 21423 from the Barstow fauna, but the Rieardo specimen is considerably worn and may originally have been the longer crowned and more progressive of the two. Two other upper cheek-teeth, nos. 21424 and 21425, from localities in the Barstow represent forms near that seen in no. 21423 described above. No. 21424 (fig. 82) is little worn and is the longest molar found in the Barstow. The pattern of the crown and of the protocone, so far as known, suggests that of no. 21423. No. 21425 is a much worn tooth and may repres...

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