irb.P‘45 
Field Season 1907 
S. M. Kindle 
Logan, Utah. 
P'7, 
Logan Canyon. The lower beds exposed at west end of 
Canyon below the power-house are the black Jefferson 
limestone and! dip strongly to S. 
Crossing the E.& 3. axis of the syncline the following 
section is seen some 8 miles above Logan. 
Feet 
a. (base) Lark bluish-gray hard magnesian limestone 
b. Light-gray or white magnesian crystalline or sub- 
crystalline limestone more or less massive. 
Crinoid stems common, also Haly sites and other 
Sil. fossils, but difficult to extract 275 
c. Lark -gray to black magnesian limestones with 
Haly sites common, also one sp. Pentamerus 
oblongus 400 
d. light to dark-gray , largely non-magnesian, frequent- 
ly thin-bedded line stone , and interbedded gray 
and some brownish shales. Limestone with 
Martinia . 280 
e. 
f. 
Dark-gray to black heavy-bedded magnesian 
Cray, mostly non-magnesian limestone (Carb. 
limestone 260 
) . . . .1000 
This Logan Canyon section differs from that of Green 
Canyon in the absence of any separating formation be- 
tween b and c. 
The boundary between e_ anf f is not sharply marked 
and is rather difficult to fix. 
