336 University of California Publications in Geology [Vol. 8 



ward from the area previously studied. The chief object of the expe- 

 dition was the collection of mammalian fossils from Tertiary deposits 

 of the region for the Department of Palaeontology of the University 

 of California. The geologic results herein presented are therefore not 

 to be regarded as being based upon a thorough investigation of the 

 region. They are, however, considered of sufficient interest to be 

 presented for record. 



The field-work in 1912 was done jointly by Mr. Baker and the 

 writer, but the pressure of other duties made it impossible for Mr. 

 Baker to prepare the results for publication. Credit is due Mr. Baker 

 for the large part of the field-work accomplished by him, and the 

 writer wishes to acknowledge with gratitude his indebtedness for the 

 results of that work. For any errors in this paper the writer alone 

 should be held responsible. The photographs used for illustration 

 are all by Mr. Baker. 



No reference descriptive of the geology of Cedar Mountain and 

 the adjacent portions of Stewart and lone valleys has been found in 

 the literature. 



Attention was called to the presence of mammalian fossils in the 

 Cedar Mountain region by Mr. J. Holman Buck of Mina, Nevada, 

 whose valuable assistance in the field-work, and in the pointing out 

 of fruitful collecting localities previously discovered by him, is grate- 

 fully acknowledged. 



The writer is indebted to Professor A. C. Lawson and to Professor 

 G. D. Louderback for aid and advice. For the opportunity of engag- 

 ing in the study of the region and for much helpful criticism and 

 counsel the writer is under obligations to Professor J. C. Merriam, 

 under whose general direction the work was prosecuted. 



GEOGRAPHIC FEATURES OF THE REGION 



The Cedar Mountain region is situated in Mineral County, west- 

 central Nevada, and lies in the western part of the Great Basin 

 (pi. 32). It is about twenty miles northeast of Mina, Nevada, the 

 nearest railroad point, and is about thirty-five to fifty miles east of 

 the southern end of Walker Lake. It is shown on the western half 

 of the United States Geological Survey Topographic Sheet of the 

 Tonopah Quadrangle. 



