THE CARBONIFEBOUS EIDGE. 121 



rejoin the plateau it curves to the northwest and its dip becomes northeast- 

 erly. Everywhere on the convex side of the curve it slopes down to Red 

 Valley. Everywhere on the concave side it presents a cliff face toward the 

 district of the slates and schists. In the following pages the local details of 

 the ridge and of the canons which intersect it will be described. 



Minne Katta Creek issues from several large springs at the base of a 

 cliff composed mainly of the upper series of the Carboniferous. A general 

 section of the cliff by Mr. Patrick is given below, beginning with the cap- 

 ping Red Bed limestone: 



Red Beds. 



Feet. 



9. Purple limestone 40 



8. Keel clay; in places a soft, red sandstone . - . , 140 



Carboniferous. 



7. A series of colored sandsLones, red, yellow, pink, etc., with calcareous layers 



and limestone 285 



G. A layer of black, sandy, carbonaceous shale Thin. 



5. Sandstone 3 



4. A layer of black, sandy, carbonaceous shale 1 



3. Sandstones, red and yellow 25 



2. Silicious and argillaceous limestone, with nodules of flint ... .to bed of creek 20 

 1. Limestone, silicious, weathering irregularly, cavernous; outcropping just at 

 the level of the creek ; probably the silicious limestone, No. 3 of the Carbonif- 

 erous section 



' The series 7 of the above section exhibits in a high degree the peculiar 

 brecciated, wavy manner of weathering characteristic of the upper sand- 

 stone of the Carboniferous. 



Near the head of Amphibious Creek the north-facing bluffs of the 

 Carboniferous limestone were seen capping an escarpment from 250 to 350 

 feet in height, and preserving in thickness and character the features of the 

 Carboniferous as observed near Red Canon Creek. The accompanying 

 section, Figure 17, was observed along the canon of the creek from its entry 

 into the sedimentary rocks to its exit in the Red Beds, a distance of about 

 nine or ten miles, the larger portion of which is through the Carboniferous 

 limestones and the red arenaceous beds of the upper Carboniferous. 

 From the rapidity of our march and the rugged character of the canon, it 



