GEOL.-VOL. I.] SMITH— COMPARATIVE STRATIGRAPHY. 357 



referred by the writer somewhat doubtfully to the lower 



Muschelkalk. It lies about eight hundred feet above the 



Ceratite limestone with the typical Lower Triassic fossils, 



and is apparently conformable with that series. Mr. H. W. 



Turner, the discoverer of the beds, made collections there in 



1899; and in 1900 and 1903 the writer visited the locality, 



adding a number of other species to the list. The cephalo- 



pods obtained by the joint collections were the following: 



Arcestid^, Parapopanoceras sp. nov. 



Ptychitid^e, Ptychites sp. nov., Nannites sp. nov. 



HuNGARiTiD^, Hungarites sp. nov. 



Celtitid^, Celtites sp. indet., Xenodiscus, sp. nov. 



Ceratitid^, Acrochordiceras sp. nov., Tirolites (Metatirolites) sp. nov., 



Ceratites ? sp. indet. 

 Nautiloidea, Orthoceras sp. nov. 



These beds may possibly belong to the Jakutic stage of 

 the Lower Trias, but the occurrence of Parapopanoceras 

 and Ptychites makes this improbable. Also Hungarites, 

 Acrochordiceras, and Tirolites are wholly lacking in the 

 undoubted Lower Trias of Idaho and California, and their 

 appearance in the American waters marks a later epoch 

 than the Brahmanic. But the character of the fauna is not 

 that of the Hedenstroejnia beds of the Asiatic regions, and 

 so they are thought to be homotaxial with the bottom of the 

 Middle Trias, older than any of the Muschelkalk beds 

 known from Nevada. Above them lie about one hundred 

 and fifty feet of shales with Ceratites f and Balatonites ? , 

 resembling forms from the Middle Trias of Nevada. 



With these beds the sedimentary Triassic series of the 

 Inyo Range ends, and above them are found sheets of 

 lavas. 



Some years ago the writer discovered fossils in the Pitt 

 shales at Silverthorn's Ferry on Pitt River, Shasta County. 

 These fossils were Anolcites conf. whitneyi Gabb, Cera- 

 tites sp. nov., and Arcestes CJoannites) sp. indet. On the 

 basis of these genera, and their occurrence about fifteen 

 hundred feet below the Upper Triassic limestone of Squaw 

 Creek, these siliceous shales were referred to the Middle 

 Trias, a conclusion still upheld by the writer. 



