396 A. HYATT — TRIAS AND JURA IN THE WESTERN STATES. 



Page 



Descriptions 413 



Fossils of American and Sailors Canyons, California 413 



Ammonitinae 413 



Pelecypoda 414 



Lower Lias Fossils of Nevada . . . . , 417 



Upper Lias Fossils from the Blue Mountains, Oregon 418 



Upper Jura Fossils of the Gold Belt Slates 420 



Ammonitinse - 420 



Belemnoids 427 



Pelecypoda 429 



Introductory. 



The following abstract gives the latest results of the examination of 

 collections of fossils, chiefly made by the United States Geological Sur- 

 vey, which have passed through my hands within the past few years. 



The descriptions of the species mentioned and of, others previously 

 noted in my paper, " Jura and Trias at Taylorville, California,"* will be 

 published by the United States Geological Survey when the proper illus- 

 trations can be prepared. 



American and Sailors Canyons, California. 

 their faunas. 



Monotis Beds. — The presence of the Trias above the Carboniferous in 

 American and Sailors canyon south of Cisco was at first considered cer- 

 tain from the presence of the Monotis beds containing two new species, 

 M. semiplicata and symmetrica, but further information is essential before 

 this can be admitted. According to the observations of Dr Curtice these 

 beds lie between the Carboniferous and the Daonella beds. 



Daonella Beds. — The Daonellahed.^ contain several species of that genus, 

 heretofore supposed to be confined to Triassic strata in Europe and in 

 this country. They immediately underlie the beds containing forms of 

 Ammonitinse described below, and also ascend sporadically into that 

 fauna in the rocks above Sterrets mine in Sailors canyon. 



There is one species, Daonella snhjecta, occurring alone in a piece of 

 black shale, which may indicate the presence of a lower bed distinct from 

 that in which the other species mentioned below were found, but, accord- 

 ing to our existing information, they must be here included in the same 

 horizon. 



Ordinarily the species of Daonella. occurring immediately underneath 

 the Ammonites bed would also be regarded as exclusively Triassic, and 



* Bulletin of this Society, vol. 3, pp. 395-412. 



