458 CHARLES H. DAVIS 
CONCLUSIONS 
First: The slate formation at Slate’s Springs dips unconformably 
under the basal Knoxville beds, as described by Dr. H. W. Fairbanks.* 
The lowest Knoxville may be assigned to the Jurassic. 
Second: The species from Slate’s Springs are very similar, and 
in five instances out of seven are practically identical with described 
Jurassic forms. None of the species are unlike Jurassic forms. 
The Alaria shows that the beds are probably not pre-Jurassic. 
Third: Five of the seven species listed from Slate’s Springs are 
identical, or nearly identical with species described from the Queen 
Charlotte Islands. The Queen Charlotte Islands beds have been 
definitely correlated by Stanton? with the Enochkin formation of 
Alaska, which is called (Upper) Middle Jurassic. 
Finally: The foregoing facts seem to place the Slate’s Springs 
(Franciscan) beds not higher than the lower Upper Jurassic. 
t “Geology of the Southern Coast Ranges,”’ Jour. Geol., VI (1898), 551-76. 
2‘ \fesozoic Section on Cook Inlet and Alaska Peninsula,’ Bull Geol. Soc. Am., 
XVI, 391-410. 
