RESUME OF LITERATURE. 85 



this. Indeed, as the Devonian fauna of the Ouray limestone occurs very character- 

 istically at Salida, its presence throughout the South Park and Sangre de Cristo- 

 regions wherever the Leadville limestone is present may be inferred with probability. 

 The red sandstone would seem to be the representative of the Maroon formation, 

 while the equivalence of the upper limestone, unless it is a localization of limestone 

 beds elsewhere distributed through the Maroon, is uncertain." 



The Red Beds generally called Juratrias in the Hayden reports are recognized 

 by Endlich, but their occurrence is apparently restricted to the eastern side of the 

 Front Range, where the\' are accompanied by patchj^ outcrops of the Paleozoic series. 



The main body of the Paleozoic outcrop described by Endlich lies in the long 

 and narrow strip brought up by the elevation of the South Park and Sangre de 

 Cristo I'anges. The portion considered by Endlich is from where Trout Creek 

 divides the Mosquito Range on the north, nearly to Sangre de Cristo Pass on the 

 south. His work, therefore, comes partly in the artificial area which has been called 

 the South Park region, and partlj' in that which has been designated the Sangre de 

 Cristo region. For the sake of continuity, however, both areas will be considered in 

 the same division of this resume, and in that portion of it devoted to the Sangre de 

 Cristo Range. 



Turning now to Endlich's report, it seems that his station 53, though I have 

 been unable to identify it with certainty upon the map, is located at the extreme 

 northern end of that portion of the South Park region included within the San Luis 

 district. A section running through station 53 is said to consist of the following 

 elements. Resting upon the granite is a bluish quartzitic limestone in. heavy beds, 

 hard and compact, containing numerous crinoidal fragments resembling lieterocrimm^ 

 and a few indeterminable specimens of Orthoceras. Then follows a thin la3'er of 

 dark-gray slaty shaies. These are succeeded by hard gra}' limestone containing in 

 its upper portion a number of corals and Spongidw, above which follow thick beds 

 of white, 3'ellow, and pink quartzite, which turn higher up into a light-red sandstone. 



What is with little doubt the continuation of this section is described on page 

 311 of Endlich's report, and from this 1 condense as follows: "Reclining upon the 

 reddish Siluj'ian sandstone and conformable with it is a thick stratum of j'ellowish 

 and brown sandy shale, covered by light-yellow and gra}' shale. Upon these rests a 

 limestone, grayish blue in color but weathering white, in which, apparently near the 

 top, were found Orthis, Prochoctus^ and Orthoceras. Overlying the limestone are 

 shales of gray and brown color, succeeded by others of a more sandy character, and 

 these are brought to a close by a series of heav}' strata of dark-blue limestone capped 

 by brown sandstone." 



a It perhaps represents the series of intermingled siliceous and calcareous beds called in the Leadville monograph 

 Upper Coal Measures. 



