BTb.p. 23 
Field Season 1907 
July 27 
Logan , Mont . 
So, 11. Section opposite Logan, I, aide of Gallatin River. 
Feet 
a. Black cr very cl a rk lino stone with seme shale at 
base# * # • * * » * • » . » * » . . . • . , * 4 o 0 
a JL 
S 4k 
©#**#■* 
*•**«•< 4 * • * 
b. Dark- colored to nearly black magnesian limestone. 
Sometimes mottled huffish end blackish limestone. 
Texture finely saocharoidal. ... . .120 
o. Buff, sometimes reddish, sandy shale and shaly 
yellow limestone near top 45 
d. Gray limestone , huffish at base 10 
e. Green argillaceous shale with limestone con- 
cretions. Fossils abt. Bp. dis;j . etc. ..... 60 
e~. Gray limestone and shale . 5 
f. Buff or yellow cal care ous sandstone becoming a 
shale in lower naif 30 
f . Gray shaly crumbling limestone . 4 
g. Hard, gray limestone in 1-4 inch strata (Garb. ) 300 *f 
Beds show s pretty uniform dip of 45 to M’. and 
strike of 1,28 B. 
Fossils are extremely rare in a and b except a small 
branching coral which is extremely abundant in certain 
strata. A Favosites was found and a few brachiopods which 
are pretty certainly Devonian. A piece of fishbone was 
also found. 
% 
Sp. dlsjunotus and Lartlnia are common in the green 
shale ; also small lame 11 ihranchs . 
