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University of California Publications. 



[Geology 



cano, an abandoned mining district, thirty miles southeast of 

 Walker Lake. Triassic fossils like those of the West Humboldt 

 Range (Nevada) were also found near Wabuska. I think I have 

 seen them in the Mining Bureau or in the Harvard collection. As 

 I remember them, Daonella dubia (Gabb) was the most charac- 

 teristic fossil — Lias." 1 The curator of the museum at the Min- 

 ing bureau said that fossils from near Wabuska had been 

 received and they were now stored and not available, but he was 

 sure there were not many. 



A section south of west in the Pine Nut Range might yield 

 further information of this character. So far as the writer is 

 aware, these represent all the rocks of marine origin within the 

 region. 



The evidence for the Tertiary is perhaps a little more com- 

 plete. The Tertiary is supposed to be of lacustrine or conti- 

 nental origin. The evidence for the lacustrine origin of the 

 beds is perhaps not so complete as for their age. One portion of 

 the evidence is the remains of a land fauna which they have 

 yielded ; and in this connection the following communication has 

 been received from Dr. W. J. Sinclair, to whom they were sub- 

 mitted for determination: "The specimens submitted comprise 

 fragments of the astragulus, calcaneum, and metapodals of a 

 rhinoceros and the astragulus of a large camel. The presence 

 of a large camel indicates that the beds from which the speci- 

 mens were obtained are younger than the John Day. The John 

 Day camels, belonging to the genus Protomeryx, are all small 

 forms. The beds are probably late Miocene or Pliocene, corre- 

 sponding to the Mascall and Rattlesnake formations of Oregon, 

 but the material is not complete enough to determine these points 

 with certainty." Of a date nearly twenty years earlier is the 

 following- by Professor Russell : ' ' Mammalian bones were 

 obtained at a number of localities in the sides of the Humboldt 

 and Walker River canons, and, with the exception of a single 

 vertebrate found in the medial gravels, they were all derived 

 from the upper lacustral beds. These fossils were submitted to 



1 Dr. Smith also kindly adds that he has reviewed the fossils from Vol- 

 cano in the Harvard collection, and found their determination correct. 

 - Mon. XI, U.S.G.S., p. 238. 



