Along the way he befriends an Aelurodon, a Barstovian
wild dog, who becomes his hiking partner, and together they face experiences both harrowing and enrapturing.
Finally, Ferrusquia-Villafranca (2003) mentioned the presence of indeterminate rodents from the Nejapa local fauna, southeastern Oaxaca, of middle Miocene (Barstovian
III-B and I, but not C-F, L-M, Q, W, and CC) figure two Cetorhinus teeth from California (most likely from the middle Miocene Barstovian
, Round Mountain Silt) under the genus Gyrace Jordan, 1923, a junior synonym of Galeocerdo Muller and Henle, 1837.
The fossil assemblages specifically indicate a Barstovian
age, which ranges from 16.0-12.5 Ma.
Calamagras weigeli was widespread temporally and geographically, previously being reported from the Chadronian NALMA (Late Eocene) of Canada, Arikareean NALMA (Early Miocene) of Wyoming, Hemingfordian NALMA (Early Miocene) of South Dakota, and Barstovian
NALMA (Middle Miocene) of Texas (3).
It may be distinguished from the Miocene (Barstovian
NALMA) species Emydoidea hutchisoni Holman 1995a, presently represented only by nuchal bones (Holman 2002), in being larger and having a longer, narrower cervical scute.
In 1995 I described a new species of turtle, Emydoidea hutchisoni, from the Middle Miocene (Barstovian
North American Land Mammal Age [16.0 to 11.5 million EP]) of Nebraska.
Pocket mice have an ancient history; the earliest identifiable Perognathus fossils are from the early Miocene, Hemingfordian fauna, circa 16-20 mya (Wahlert 1993), and, by Barstovian
time (12-16 mya), four different kinds of Perognathus are distinguishable (Savage and Russel 1983).
antica on the basis of a single, poorly preserved (and poorly illustrated) trunk vertebra from the middle Miocene (Barstovian
NALMA) of Texas.
It occurs from the Miocene to the Recent in North America and ranged into Saskatchewan, Canada in late Barstovian
times (Holman 1970), well northwest of its present range.
[downsi.sup.*], or from numerous other (unpublished) plesiomorphic xantusiids ranging in age from Barstovian
(middle Miocene) to early Irvingtonian (early Pleistocene; CJB, pers.
All sites are Barstovian
and the three most abundant categories of small mammals are the geomyoid, cricetid and heteromyid rodents.