Geol.-Vol. I.] SMITH— COMPARATIVE STRATIGRAPHY. 345 



writer, compares at considerable length the American with 

 the European faunas. 



In 1896 Dr. C. D. Walcott discovered some ammonite- 

 bearing limestones in Inyo County, California, on the 

 Union Wash, east side of Owen's Valley, about three miles 

 up from the mill of the Reward Mine. These fossils were 

 submitted to the writer for identification, and proved to be 

 of Lower Triassic age. They were not in good condition 

 for the identification or description of species, but it was 

 possible to identify a number of genera that are character- 

 istic of the Ceratite formation. Lower Trias, of the Oriental 

 region. A preliminary report on this discovery was pub- 

 lished by the writer (33). Since that time Mr. H. W. 

 Turner, of the United States Geological Survey, has visited 

 this locality, adding to the collections, and discovering a 

 second ammonite bed about eight hundred feet above the 

 first, with a different fauna, thought by the writer to belong 

 to the lower Muschelkalk. During the winter of 1900- 

 1901, and in 1903, the writer visited this locality, and with 

 the assistance of Messrs. T. J. Hoover and A. M. Strong, 

 made extensive collections from both horizons, including a 

 number of new genera and many old ones never before 

 found in America. 



Recently Mr. W. Lindgren (16) has discovered in south- 

 eastern Oregon fossiliferous Triassic limestone, but the 

 fossils have not yet been identified. 



Mr. R. S. Spence has recently discovered a new locality 

 for Lower Triassic ammonites, one mile west of Paris in 

 southeastern Idaho. The beds contained among other 

 fossils, Meekoceras, Ophiceras, Celtites, and Pseudosa- 

 geceras. 



The writer has now visited in person all the Triassic 

 provinces of the United States and has collected at all the 

 principal localities in each province. Therefore his state- 

 ments as to the occurrence of genera or species in this 

 region are based on personal observation, and on collec- 

 tions made by himself. In addition to collecting at all the 

 principal localities for Triassic fossils, he has studied the 



