New Early Miocene Formation and Vertebrate Local Fauna, Big Bend National Park, Brewster County, Texas
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The early Miocene Delaho (new) Formation is a locally derived sequence of basin fill sediments now severely deformed by later Tertiary normal faulting. These sediments contain the Castolon local fauna comprising seventeen mammalian taxa. Three genera are new. Age of the Castolon local fauna is considered middle Arikareean, and differences between it and other Arikareean faunas are caused in part by ecological bias.
Contents: Abstract -- Introduction -- Acknowledgments -- Localities -- Synopsis of Fauna -- Part I: Geology -- Part II: Systematic Descriptions, Excluding Lagomorpha -- Part III: Systematic Descriptions, Lagomorpha -- Part IV: Age and Interpretation of the Castolon Local Fauna -- Literatrue Cited