18() oarhonib'erous formations and faunas of Colorado. 



is tlu'sc licds which ai'o rcprcsonti'd uiulcr the Upper Carlujiiifonni.s color in the iitlas, 

 anil [)i)ssihly sonic of tho Red Beds above are included with them. Peah;, in his 

 Pleasant Park section, refers the overlying sandstone to theTriassic. Lee, however, 

 is disposed to assign to the Carboniferous a series of undesignated thickness at the 

 base of the Red Beds in Perry Park, which he correlates with the Fountain forma- 

 tion of the Pikes Peak quadrangle. He repi'esents this series upon his map as occu^r- 

 ving beneath the Triassic or Red Beds in Perry Park, but not farther north, on Platte 

 Canyon. If this correlation with the Fountain formation is authentic, the appear- 

 ance, at the base of some of the thicker sections of the tj^pical Wyoming formation, 

 of beds representing tiie Fountain series, is much more probable. 



A considerable area of Triassic is represented by the Hayden atlas as occurring 

 in Manitou Park, and beneath it beds of Lower Carboniferous and Silurian age are 

 colored in. I can not see upon what evidence the Lower Carboniferous color is 

 introduced into this area, however, as the Millsap limestone is apparently missing, 

 while that portion of the "Triassic" coming in the southern part of the tract depicted 

 on the map, which is included in the Pikes Peak quadrangle, is regarded by Cross as 

 belonging to the Fountain formation, sujjposed bj^ him to be of Carboniferous age. 

 From the best evidence at hand, therefore, it would appear that the "Lower Car- 

 boniferous" is probably lacking in Manitou Park, that the "Triassic" of that area 

 represents the Fountain and not the Wyoming formation, and that it is probably 

 Carboniferous and not Triassic in age. 



Near Colorado Springs the Triassic is represented as underlain by Upper Car- 

 boniferous, Lower Carboniferous, and Silurian beds. I have elsewhere suggested 

 that in Peale's Glen Erie section part of a considerable thickness of limestone 

 lying beneath the Red Beds is to be correlated with the Millsap limestone, and it 

 is probably this bed which is represented as Lower Carboniferous on the Hayden 

 atlas. In this section Peale gives as occurring above the Millsap limestone (?) and 

 below the Jurassic about 1,200 feet of sandstone of red and white colors, which he 

 calls Triassic. It seems probable, in fact, that all these beds belong to the Fountain 

 formation, and that the Triassic, though represented on the map, is really absent, 

 the Morrison coming down upon the Fountain formation exactly as in Garden Park, 

 in the Pikes Peak quadrangle; and it is apparent from the following quotation that 

 Hayden must have referred nearly if not quite all of Peale's Triassic beds to the 

 Carboniferous. Hayden says, "On the small map of ' Colorado Springs and vicinity,' 

 a light band will be seen between the Silurian on the west and the Red Beds or 

 Triassic on the east, which represents a peculiar group of strata not observed else- 

 where on the eastern slope, but resembling veiy closel}- a series of variegated beds, 

 described by Dr. Peale in the annual report for 1873, in the vallej^ of Eagle River, 

 which yielded well-marked Carboniferous types. This group of strata is composed 



