474 Scientific Intelligence. 
It was on the strength of this —— that I ventured to 
extend the range of the Alpine Trias as far as British Columbia, 
in the little sketch I sent of our ccomdhi por: which was published 
in this Journal for August 1864 (vol. xxxviii, p. 261). 1 did not 
fail to impress on Mr. Dall, when he start rted for Alaska, the im- 
portance of keeping a sharp look-out for the fossils of this interest- 
ing formation. He was not, however, so lucky as to fall in with 
any fossiliferous deposits of importance, nor was he able to throw 
Hea gee n the occurrence of the specimen brought by the 
trance of Pavalouk Bat ay, which were ésiauty crowded w ith ‘ a 
species of Monotis, and which M. Fischer refers to the yer 
Trias, thus in all probability, extending the range of this interest- 
ing formati ion, not merely as far as British Columbia, but even to 
the Alaskan peninsula. It is possible that the Hecate’s specimen 
was from the very region visited by M. Pinart. This is, indeed, 
the more probable since, in spite of all my inquiries, I have never 
yet been able to learn of any fossiliferous rocks cropping out 
along the coast of British Columbia, or any where on the main- 
land 1 a ot our boundar 
b Gkewih one As the Awcella is the most abundant and charac- 
teristic fossil of the Jurassic slates of the Apa apt of California, 
his occurrence is also not without interest to u uw gin g irom 
the discoveries of Messrs. Grewingk and Pinart, there is a good 
field for paleontological investigation, as well as for the study © 
voleanic phenomena, on the Alaskan peninsula and among adja- 
cent groups of islands, 
' It is interesting to notice how this remarkable grouping ° 
fossils a characterizes the Alpine Trias, and which seemed for 
o have such a limited range, has now been traced all 
Sround the world, New Zealand, New Caledonia, the Pacific coast 
of North America, High India, Spitzbergen ; these are localities 
in which the peculiar Monotis- and Halotia “bearing slates have 
ag found within the past ten or fifteen years. 
2. Notes to page 438, on mountain-making ; by J. D. Dana.— 
(1.) Although no ease ‘of unconfo rmability between the Carbonil- 
erous and the underlying Palacsiia is yet distinctly made out in 
the Sierra Nevada, the Great Basin, or the Wahsatch, she ens 
farther nape according to Mr. J. W. Powell, in the vi 
the Grand Cajion of the Colorado. (See page 457 a this Jeane) 
The The fact that Whitney has found no rocks lower 
erous in the Sierra may be a consequence of logs ae uncon- 
