from Meadow Valley Region, S. Nevada. 255 



Overton and Logan, Lincoln Connty, Nevada, where the 

 beds were examined in detail, they consist of well indu- 

 rated sands and clays, red and light brown in color, that 

 overlie unconformably the early Tertiary deposits in this 

 region. A small vertebrate fauna, including camels and 

 a horse, was collected in the fine sandstone approximately 

 three miles west of Overton. The sedimentary deposits 

 of Muddy Yalley, in which mammalian remains were 

 found, may be known as the Muddy Valley beds as dis- 

 tinguished from the Panaca deposits of Meadow Valley. 



Comparison of Faunas from the Meadow Valley Region. 



Unfortunately few species are represented in the Ceno- 

 zoic faunas from the Meadow Valley region, and much 

 additional vertebrate material must be secured before 

 satisfactory comparison can be made between the mam- 

 malian assemblages at present recognized by fossil 

 remains in the Panaca beds of Meadow Valley and in the 

 Muddy Valley deposits of Muddy Valley. 



Eemains of Equid^ found near Panaca, Nevada, belong 

 to large types presumably related to species of Plio- 

 hippus or to early forms of Eguus. . . In contrast to the 

 species from the Panaca beds, that from the Overton 

 deposits, so far as evidence is procurable from a single 

 incisor tooth, seems to represent an earlier stage in the 

 history of the horse group. The incisor from the Overton 

 beds resembles closely in size comparable teeth of Mery- 

 chippus. This genus occurs commonly in Miocene 

 deposits of the Great Basin region. 



Among the fragmentary rhinocerotid remains obtained 

 in the Panaca beds is a phalangeal element similar in 

 size and shape to phalanx 1, digit 3, manus of Teleoceras 

 fossiger. Members of the Ehinocerotidae are known 

 from the Tertiary deposits of western North America, 

 but apparently are not found in deposits later in age than 

 Lower Pliocene. 



Camel remains from the Panaca beds apparently 

 belong to a species of the Pliaiichenia group, while 

 materials from Muddy Valley are presumably referable 

 to genera other than Pliauchenia. A fore-foot of an im- 

 mature camel from the Muddy Valley deposits may 

 belong to AUicamelus or to Procamelus, while a single 



Am. Jour. Sci.— Fifth Series, Vol. II, No. 11.— November, 1921. 



18 



