GEOGRAPHIC RELATIONS OF TRIAS OF CALIFORNIA 777 
Professor Alpheus Hyatt’ next undertook a revision of 
Gabb’s work, visiting the original locality and adding largely to 
the ‘faunal list, and especially to our knowledge of the strati- 
graphic distribution of the species. 
In 1892 the writer’s attention was called by Dr. H. W. Fair- 
banks to a bed of ammonite-bearing limestone near Pitt River in 
Shasta county; on examination the fossils proved to be of 
Upper Triassic age. This locality was soon afterwards visited 
by the writer, who spent the field season of 1893 at work in that 
region. This work added over fifty species to the known fauna, 
chiefly of Karnic age, and nearly related to characteristic 
species from the Tyrolean Alps.? The writer has since spent a 
good part of the field seasons of 1895 and 1898 collecting in 
that region, and has added greatly to the fossil list, especially 
of the Ceratitide and the Tropitide, bringing out even more 
strongly the relations with the Alpine Trias. A part of these 
results has already been published.? 
The latest paper on the Triassic stratigraphy of California is 
by Dr. E. von Mojsisovics,# who, on the basis of communica- 
tions of Professor Hyatt and the writer, and a suite of fossils 
sent him by the writer, compares at considerable length the 
American to the European Upper Triassic faunas. 
The accompanying table is based on that published by the 
writer in Classification of Marine Trias, but revised and brought 
up to date so as to include the stratigraphic work of the past two 
years, and to give a satisfactory basis for the correlation of 
marine Triassic sediments for all known regions. Of course it 
is only tentative, merely the opinions of several men engaged in 
this study; but the wide distribution of such zone faunas as 
t Bull. Geol. Soc. Amer., Vol. III, “ Jura and Trias at Taylorville, California,” pp. 
397-400. 
2Jour. GEOL., Vol. 1], No. 6, 1894, “ The Metamorphic Series of Shasta county, 
California, and Jour. GrEou., Vol. I1I, No. 4, “Mesozoic Changes in the Faunal 
Geography of California.” 
3Jour. GEOL., Vol. IV, No. 4, “Classification of Marine arias 
4Denksch. K. Akad. Wiss. Wien. (Math. Nat. K1.), Bd. LXIII, 1896, “ Beitrage 
z. Kennt. d. Obertriadischen Cephalopoden Faunen des Himalayas. 
