314 



GEOLOGICAL SURVEY OF THE TERRITOEIES. 



alternate, producing Cretaceous fossils, and after tlney have continued 

 for sometime, after the bluft's reach far into the prairie, another sand- 

 stone bluff makes its appearance, which may be regarded as the lowest, 

 or one of the lowest members of the Tertiary, (^.) Throughout the red 

 beds no fossils were found. Proceeding in a southwesterly direction, 

 the section (B) taken through station 96 presents the following aspect: 



Eeclining against the granite of the Front range w^e find a red sand- 

 stone, dipping off to the southeast at an angle of about 22°, covered by 

 thin stratum of bluish limestone and then white sandstone. Above 

 these red sandstones occur again, underlying the red conglomerate (o) 

 mentioned above, which bears the same character throughout. Eed 

 shaly saudstones are found above the conglomerate, becoming more com- 

 pact as they go higher, {d.) Overlying these there are bluish and white 

 shales, (e,) partly dolomitic, covered in turn by a brownish-red sandstone 

 (/) that is mostly quartzitic. This sandstone forms the bluff upon which 

 station 9(3 waslocated, and contains numerous remains of leaves. White 

 sandstones, andhigher up white marls, shales, and limestones, are found 

 above it. Analogous to the preceding section, a new bluff i^ eventually 

 formed by white and yellow sandstones, (i,) belonging perhaps to the 

 Tertiary. 



Through station 11, about a mile west of Canyon City, the third sec- 

 tion is located, running almost due east. (Plate X, section C.) Granite 

 again underlies the red sandstone, dipping at an angle of about 24P to 

 the east. The succession of strata is almost identical with that given in 

 the preceding sections; but the red conglomerate (o) occurs in greater 

 thickness than heretofore noticed, and also the beds overlying it are more 

 developed. Again, the high bluff is formed by a yellow to light-brown 

 sandstone, (/,) overlying the upper Mesozoic shales, (e,) underlying the 

 succeeding Cretaceous ( ). By giving these three sections in tabulated 

 form the constancy in the succession of their strata will become more 

 evident. In the subjoined table the strata are" arranged without refer- 

 ence to their thickness, which, as a rule, increases slightly from section 

 A to B and to C. 



Section A, Plate X. 



Section B, Plate X. 



Section C, Plate S. 



White sandstone. 



Tellow sandstone. 



Tellow and white sandstone. 



White sandstone and marls. 



Brown and jellow shales. 



White sandstone. 



Tellow and brown sandstone. 



Lignite formation. 



Tellow shales. 



White and yellow shales, inter- 

 stratifled with limestones. 



White, gray, and yellow lime- 

 stone and shales. 



White limestones and shales. 



White and gray limestone, with 

 Inoceramus. 



White sandstone. 







White limestone and marls. 





Tellow marls and shales. 



Eed quartzite. 







Eed quartzite. 



White shales. 







Tellow sandstone, with plants. 



Keddish sandstone, with plants. 



Tellow sandstone. 



