Puhlications of Scientific Societies. 117 



Age of the auriferous slates of the Sierra Nevada; by James 

 P. Smith. Bull. Geol. Soc. of America, vol. 5, pp. 243- 

 258. February 27, 1894. 



Conclusions that the auriferous slates consist of Silurian, Car- 

 boniferous, Triassic, and Jurassic strata. The Mariposa slates are 

 Upper Jurassic. 



Trias and Jura in the Western States; by Alpheus Hyatt. 

 Bull. Geol. Soc. of America, vol. 5, 1894, pp. 395-434. 



The author places the relative age of the rocks of California, in 

 different localities, as follows : 



Trias — American and Sailor canj'ons. 



Lower Jura — Inyo County, Cal. ; Taylorville, Cal. 



Middle Jura — Taylorville, Cal. 



Upper Jura — Taylorville, Cal. ; Mariposa Basin, Cal. ; Colfax 

 Basin, Cal. 



The following new species of fossils are described, but not figured : 



From American Canyon : Jlonotis semplicata ; M. symmetrica. 



From Sailor Canyon: Daonellaf suhjecta; D. hochiformis; D. 

 cardinoides; Hemientolittm? sp.?; Panopea? sp.?; Entolium sp.?; 

 Chryphaea sp.? 



Upper Jura fossils of the gold belt slates : Gardioceras duhium, 

 Texas Ranch, Calaveras County ; Perisphinctes virgulatiformis, 

 near Reynolds Ferry; Perisphinctes sp.?, the same; P. filiplexf, 

 Quenstedt, Tuolumne River, etc. ; P. Colfaxi, Gabb, one mile west 

 of Colfax ; P. Muhlhachi, El Dorado County ; Olcostephanus Lind- 

 greni, near Colfax; Oecotraustes denticulata, Stanislaus River; Bel- 

 emnites Pacificus, Gabb, Mariposa County, American Canyon ; 

 Avicula sp. ?, Stanislaus River; Amusium aurarium, Meek, six 

 miles from Copperopolis ; Aucella Erringtoni, Meek, var. arcuata, 

 Tuolumne River, etc.; A. elongata, Stanislaus River; var. A. elon- 

 gata orbicularis, A. avictilaeformis, near Reynolds Ferry ; var. acuta, 

 six miles from Copperopolis ; A. orbicularis, Calaveras County. 



The Shasta-Chico series; by J. S. Diller and T. W. Stanton. 

 Bull. Geol. Soc. of America, vol. 5, pp. 435-464. April 12, 

 1894. 



The authors give the following conclusions : That the discovery of 

 Coralliochama Orcutti, in the basal portion of the Chico beds, in 

 the Sacramento Valley, demonstrates that the Wallala beds are only 

 a phase of the Chico. The Shasta-Chico series is composed of the 

 Knoxville, Horsetown, and Chico beds, which are each characterized 

 by its own fauna. The fauna of adjacent beds, however, are so 

 bound together by many common species that there is no paloeon- 

 tologic break. The Mariposa and Knoxville beds are faunally dis- 

 tinct and unconformable ; the former Jurassic, and the latter Cre- 

 taceous. 



Geological sketch of Lower California ; by S. F. Emmons and 

 G. P. Merrill. Bull. Geol. Soc. of America, vol. 5, pp. 

 489-514, pi. 19. April 21, 1894. 



