BLACKFOOT AND RAVALLI SERIES 7 

 Resume 



Feet Feet 



1. Calcareo-arenaceous beds 155 



2. Shaly limestones 1,310 



3. Calcareo-arenaceous shales 155 



4. Thin bedded limestone 815 



5. Shaly and thin bedded limestone 520 



6. Siliceous limestone 1,850 



4,805 



In this section, below the Blackfoot series, the purple and green 

 siliceous beds of the Eavalli series have a thickness of 2,150 feet to a fault 

 2.5 miles south of Mineral hill. 



Ravalli series 



The Blackfoot Limestone series, with the siliceous red beds above and 

 purple beds below, are repeated to the westward of the Continental divide, 

 in the Swan and Mission ranges, the limestones forming the high sum- 

 mits on both ranges ( see plate 3 ) . West of the Mission range the lower 

 portion of the Blackfoot series is exposed in the high hills east of Eavalli 

 and Jocko creek. Below the limestones there is a great thickness of 

 siliceous strata, the lowest beds of which were found on Jocko creek, 

 about a mile above Ravalli. 



Feet Feet 



1. Fine grained, quartzitic sandstones of purplish gray and 



gray color. In the lower portion the purple to purplish 

 gray form bands of color, and above the gray and then 

 the purplish tints predominate 2,550 



2. Bedded, compact, gray sandstones 1,060 



3. Greenish gray, fine grained, compact, quartzitic sandstones, 



in layers 4 inches to 2 feet thick, with an occasional bed 



of shaly sandstone 4,645 



Resume 



1. Purple and gray beds 2,550 



2. Gray beds 1,060 



3. Greenish gray beds 4,645 



8,255 



Resume of Camp Creek, Mission Range section. — The following is a 

 resume of the Camp Creek, Mission Range section: 



Cambrian. 



Plane of unconformity. 



Algonkian, Belt terrane. 



Camp Creek series 11,700 



Blackfoot series 4,805 



Ravalli series 8,255 



24,760 



