784 JAMES PERRIN SMITH 
that a part of the Star Peak beds of Nevada may eventually be 
shown to belong here, as Professor Hyatt has long claimed, but 
as yet the evidence is not convincing. = 
UPPER TRIAS. 
The Upper Trias of the Genessee valley, Plumas county, was 
discovered and described by the Whitney Survey; its fauna is 
decidedly Alpine in character, although all the species thought 
by Gabb to be identical with European forms have since been 
shown not to agree with them. Since that time Professor Hyatt* 
has visited this locality, and has added greatly to the fossil list, 
some of the newly discovered ammonites being doubtfully 
referred to Alpine species. 
The Upper Trias of Squaw creek, Shasta county, was discov- 
ered by Dr. H. W. Fairbanks, who called the writer’s attention 
to the locality. The writer has since spent a good part of three 
field seasons in collecting fossils, and in studying the stratigraphy 
of that region; part of the results of this work has already 
appeared in the JouRNAL OF GEoLocy.? In the papers referred 
to the most important species have been listed, although later 
field and museum study has changed the list considerably, add 
ing many new ones, and dropping several. The fauna contains 
a large number of Zrachyceras (subgenus Protrachyceras), Cho- 
nites, Arpadites, Polycyclus, Sirenites, Tropites, Eutomoceras, Juva- 
vites, Sagenites, Nannites, Miltites, Arcestes, Halobia, etc., of decid- 
edly Europeantype. Dr. E. von Mojsisovics is of the opinion 
that several of these may be identical with species characteristic 
of the Tyrolean Alps. The greater part of the fauna belongs to 
the Karnic stage, zone of Tropites subbullatus Hauer, which char: 
acteristic ammonite of the Sandling beds is also present in great 
abundance in the Squaw creek limestone, showing all the vari- 
eties known in the Alps. 
In the papers cited above the writer has called attention to 
the occurrence of species Zvachyceras along with Tvopites subbul- 
t Bull. Geol. Soc. Amer., Vol. III, pp. 397-400. 
2 Vol. II, 1894, No. 6; Vol.1II, 1895, No. 4; Vol. IV, No. 4, 1896. 
