THE CARBONIFEROUS RIDGE. 121 



rejoin the ])lateau it curves to the northwest and its dip becomes northeast- 

 er!)'. lOverywliere on the convex side of the curve it sloj)es down to Red 

 Valley. Everywhere on the concave side it presents a clitl" 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: 



Eed Beds. 



Feet. 



9. Pur[)le limestone 40 



8. Red clay ; in places a soft, red saudstone 140 



Carboniferous. 



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



and liuietiitone 285 



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



5. Sandstone 3 



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



3. Sandstones, red and yellow 25 



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

 1. Limestone, silicions, weatbering; irregidarly, cavernous; outcropping just at 

 the level of the creek: jjrobablj- the silicious limestone, Xo. 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 cai3on, it 



