110 
MUSEUM BULLETIN NO. 2. 
These sections differ from those of Walcott 1 in the correlations, 
in the substitution of the Fort Mountain for the Fairview, 2 
and in the addition of the Ottertail and Chancellor formations. 3 
The only correlations which can be assumed, from our present 
information, to have any certainty are (a) the equivalence of 
at least part of both the Hotaand Chetangto the Mount Whyte 
and ( b ) the equivalence of the Stephen to the lower portion 
of the Titkana. The Mumm, Hitka, Tatay, Mahto, Tah, 
and McNaughton formations in the Mount Hobson district 
have proven unfossiliferous 4 and this is also true for the Bos- 
worth and Fort Mountain formations near Mount Bosworth. 6 
(See also the section of the A Ibertella fauna, pages 116-120). 
Summary . — The data presented in the preceding pages are 
largely utilized in the discussion oft he boundary between the 
Low r er and Middle Cambrian, pages 112-115, and form the 
basis also for the discussion of the Albertella fauna, the Pioche 
formation, and the Burton shales, but the following summary 
statement may be useful; — 
In the Big Cottonwood Canyon, Oquirrh Range, and Pioche 
sections, the only localities northeast of the Highland range 
from which Olenellus has been obtained, the quartzite series is 
succeeded by siliceous or sandy shales; where the same series 
grades into limestone in the northern portion of the Wasatch 
mountains, both the limestone and the overlying argillaceous 
shale carry Middle Cambrian fossils, and at one point (Mill 
canyon) this fauna extends into the underlying quartzite. 
Diagnostic fossils were not discovered at the following localities, 
but if the above generalization may be applied to this portion 
of the Cordilleran region, Mill canyon, Idaho, and Blacksmith 
Fork, East Fork canyon, Geneva, Wasatch canyon, and Promon- 
tory point, Utah, all represent sections where the upper part of 
the quartzite series is of Middle Cambrian age; and this appears 
to hold for the Onaqui range, 50 miles southwest of Big Cotton- 
wood canyon. With this exception, however, the quartzite series, 
1 Smithsonian Misc. Coll., vol. 57, No. 12, 1913, p. 343. 
* Walcott: Mon. U. S. Geol. Survey, vol. 51, 1912, p. 131. 
* Allan, Summary Rept. Geol. Survey Branch, Dept. Mines, Canada, for 1911, 
1912, p. 178. 
4 Smithsonian Misc. Coll., vol. 57, No. 12, 1913, pp. 337-339. 
6 Walcott: Mon. U. S. Geol. Survey, vol. 51, 1912, pp. 12&-131. 
