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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 78 



Fig. 42. — View northward across Gallatin River, north of Manhattan, Mon- 

 tana. Low hills of Paleozoic rocks. Nixon's Gulch on right side. (Photograph 

 by E. R. Pohl.) 



Fig. 43. — Gallatin Valley at Logan, Montana. Upper Cambrian strata at 

 extreme right. Massive cliff, Jefferson limestone. Gully at left typical feature 

 due to outcrop of the Three Forks Shale. (Photograph by E. R. Pohl.) 



