BULL. GEOL. SOC. AM. 



VOL. 32, 1920, PL. 9 



Figure 1. — Distaxt Vikw of IMiddle Butte, looking Southeast 



T^^. 





jJfe^!^eAt&&^' ^ al.^' -A.^ 



FiGuuE 2. — View of Laccolith M. 1 of Figure 4, al.so called Gold Butte 



The view is talien looking due east. Tlie conical laccolith rests on the Colorado shales. A 

 thick sill in the Colorado shales runs from left to right across the middle foreground. 



MIDDLE AND GOLD EUTTES, SWEET GBASS HILLS, MONTANA 



