EECAPITDLATIOW OF PALEOZOIC FORMATION'S. 175 



should be placed in the Red Beds. The lower division, which probabl}" somewhat 

 overlaps with the other Pei'mian section but may follow it, with or without an inter- 

 val, consists of pink, brown, and gray shalj^ standstone, with thin interlaminated 

 beds of limestone below, followed by shales, sandstones, and limestones in alternating 

 colors of pink, brown, gray, yellow, white, cream color, and blackish. With the 

 addition of these strata the equivalent of the Maroon would have a thickness of ■±,376 

 feet, approximately, and with the characters above designated. This thickness is 

 greater than that of the Maroon in the Aspen district, which Spurr places at 4,000 

 feet, and less than the maximum thickness of the original Maroon, which measures 

 4,500 feet. It is possible, however, that in the latter measurement are included 

 bodies of metamorphosed and no longer recognizable Triassic. The lithologic char- 

 acters of Peale's series differ in detail from either the Aspen or the Crested Butte 

 Maroon, and seem to be more like the Weber grits and Maroon series of the Ten- 

 mile and Leadville districts. The Maroon at Aspen seems to be nearly uniform 

 throughout, to contain verj^ little conglomerate, and to be of a dark brownish-red 

 color. On Eagle Eiver the conglomeratic bands appear to be more numerous, and 

 while brownish and red beds occur, to consist mainly of grays. The original Maroon 

 was divided into two approximately equal series, the upper of which was character- 

 ized by being a conglomerate and possessing a dark maroon color. On Eagle River 

 beds of conglomerate and others of deep-red color occur, but instead of being segre- 

 gated in the upper portion of the section, are distributed through it. The upper 

 part of Peale's second Permian section, which I would unite with the "Triassic" as 

 part of the Red Beds, is, as I have already said, from 500 to 800 feet in thickness, and 

 consists of gypsiferous shale and sandstone having generally a pinkish or red color. 

 The Triassic contains 978 feet, and consists of sandstone of red, pink, purplish, 

 brown, white, and light colors, the red largely predominating. United these two 

 sei'ies make up 1,478 to 1,778 feet of sediments, generally similar to Spurr's Triassic 

 and to the Wj^oming formation of the Tenmile district, the former of which meas- 

 ures 2,600 feet and the latter 1,500 feet. In Tilden's section at Battle Mountain, 

 near Red Cliff, he found above the Leadville limestone 1,000 feet of Carboniferous 

 limestone which would seem to Ije the equivalent of the Weber limestone and the 

 Weber shales. In Peale's Eagle River section the Weber shale can hardly measure 

 less than 1,000 feet, and at Aspen it measures 1,000. In the Crested Butte quad- 

 rangle, however, its thickness is from 100 to 550 feet, and in the Tenmile district it 

 is only about 300 feet. 



Peale found no distinctive invertebrate fossils, save a few species already 

 mentioned. In the case of his Permian series, the age assigned rests upon a few 

 plants which Lesquereux identified as C'cdamites suckovii Brogn., Stigmaria ficoides, 

 .and C'alamites gigas Brogn. Before accepting the Permian age of these beds, in 



