Museum, University of Nebraska State


Date of this Version



Occasional Papers of the Museum of Texas Tech University (February 28, 1974) 20: 1-8.


Copyright 1974, Texas Tech University. Used by permission.


During the 1972 field season, a small collection of micromammals was obtained from the Anceney Local Fauna located 13 miles west of Bozeman, Gallatin County, Montana. The fauna is Barstovian in age (Upper Miocene) and is preserved in an ash-filled channel deposit in the Madison Valley Formation (Dorr, 1956). A single partial jaw of a chiropteran was recovered along with numerous bones and teeth of other mammals, birds, amphibians, and reptiles. The jaw is complete from incisors back to the level of the m2. Examination of the jaw and comparisons with Recent and fossil chiropterans has convinced us that it represents a new genus and species of the subfamily Vespertilioninae.