RESUME OF LITERATURE. 133 



The section as here given is compiled from two parts of what appears to be a 

 single continuous series divided into its Carboniferous and Triassic portions, and 

 separately described on pages 71 and 82 of Peale's report. For comparison with 

 sections similar!}- arranged of other areas examined by him, Peale has condensed 

 the Carboniferous portion of this section and grouped its beds in the following 

 form, which appears on page 77 of the same report: 



General section in region of Dolores Rivei — district of 1S75. 



PERMIAN. 



Feet. 

 Pink conglomeritic .sandstone.s and red gypsif erous shales 1, 000 



COAI, .^lEASrRES. 



Shales mostly arenaceous with calcareous and gypsiferous beds at the top. The beds 



are generally concealed ; debris is light-yellow color 3, 500 



No fossils. 



SUBCARBOXIFEROUS. 



Limestone, only upper part showing fossils, indistinct and not determined. Productus, 



corals, and crinoidal stems 300 



Total - 4, 800-5, 000 



The correspondence of this section with that previouslj' quoted is obvious and 

 requires little comment save in the case of the Permian. In the original section the 

 shales at the base of this division are described as yellowish and black, while in the 

 later form their color is said to be red. 



It is to be noted that the stratigraphic ba.se of the section here is not given, 

 and presumably was not ob.served. Peale is inclined to believe that the lowest bed 

 is near the line separating the Mississippian fi'om the Pennsylvanian. It maj' be 

 provisionally regarded as representing the horizon of the Ouraj'' and Leadville lime- 

 stones. Beds 3 and 4 are referred bj- Peale to the Upper Carboniferous or Penn- 

 sylvanian, while 1 and 2 he calls Permian or Permo-Carboniferous. " Eastward the 

 beds rapidly thin out and Nos. 2, 3, -i, and 5 disappear. No. 1 on West Creek rests 

 on the granite and is made up of coarse conglomerates, especially at the base, show- 

 ing the near proximity of land during their foi'mation." "Along the Dolores River 

 the pink conglomerates [upper Permian ^ and sandstones appear beneath the blood 

 red .shales and sandstones that lie immediately below the massive red .sandstones that 

 cap the bluffs." These remarks describe the section quoted above, but appear to be 

 less applicable to the Triassic exposures elsewhere. 



"The general character of the Triassic beds is as follows: A massive yellow, 

 white, or pink sandstone forms the top of the .series. Toward the western part of 

 our district this sandstone is calcareous. In many places the sandstones are mark- 

 edly ci'oss-stratified. The color is subject to much change locally, passing from 

 white, through orange and pink, into deep red. Below the massive sandstone are 



