18 JAMES PERRIN SMITH 
age of certain disputed beds thousands of miles away, occurring, 
as it does, associated with survivors from the underlying beds in the 
same section, and above both the Tzrolites and the Meekoceras 
faunas in the same canyon. In the first place, this proves the 
Lower Triassic age of the Meekoceras beds, if further proof were 
needed, since several abundant and characteristic species range 
through the entire section, and since the Tirolites beds, only a few 
feet below, contain a fauna virtually identical with that of the 
classic Campil beds, the type of the marine Lower Triassic of the 
Mediterranean region. But the Columbites beds belong to a hori- 
zon higher than any yet found to be fossiliferous in the original 
Mediterranean section, that is, to the barren upper Campil beds, as 
will be shown later in the discussion of the Albanian occurrence of 
this formation. 
The Olenek beds of northern Siberia have long passed as the 
equivalents of the upper part of the Lower Triassic, but without any 
definite proof. Now since the faunas of the Olenek beds of Siberia 
and of the Columbites beds of Idaho are so closely related, and the 
stratigraphic position of the. latter is positively known, the long- 
desired proof is brought. The Olenek beds are Lower Triassic, 
but younger than the Tirolites beds of the Mediterranean region. 
Further proof of the validity of these conclusions has recently 
been published by Dr. G. von Arthaber,t from Albania on the 
Balkan Peninsula. Dr. von Arthaber describes from that region 
an assemblage of genera very like that of the Columbites fauna of 
Idaho, with some species that he considers identical; they include: 
Columbites, Meekoceras, Celtites, Hedenstroemia, Sageceras, Pseudo- 
sageceras, Nannites, Lecanites, Pronorites, Tirolites, Parapopano- 
ceras, etc. According to Dr. von Arthaber, Pseudosageceras 
multilobatum Noetling is the same as P. intermontanum H. and S., 
and Nannites heberti is identical with N. dieneri H. and S., and 
those two species are also known in the Hedenstroemia beds of 
India. I do not agree with him as to the Albanian species of Pseu- 
dosageceras, which seems to me to be identical with P. zntermonta- 
« “Ueber die Entdeckung von Untertrias in Albanien und ihre faunistische Bewer- 
tung,” Mittheil. Geol. Gesell. Wien, I (1908), 245-89; and ‘‘Ueber neue Funde in 
der Untertrias von Albanien,” zb7d., II, 1909, 227-34. 
