PALEOZOIC STRATIGRAPHY OF ROCKY MOUNTAINS 385 



any part of the true Madison seen by the writer elsewhere. So far 

 as known, it is wholly barren, as is likewise Member 19. It may 

 belong to the Richmond series. However, if the Devonian system 

 is represented in the sections named, it includes this belt, and pos- 

 sibly the underlying massive member which separates it from the 

 fossiliferous Upper Bighorn. 



Member 21, comprising black shales overlain by yellow or red 

 aranaceous strata, is found at Crandall Creek and Dead Indian 

 Creek in the Absaroka Range with a development almost precisely 

 like that shown in most of Haynes's sections near Three Forks. 

 Haynes 1 considers that the fauna of this member is transitional to 

 the Mississippian. 



The Three Forks formation in northern Utah; correlation with 

 the Benson and Ouray limestones. — Richardson 2 reports very poor 

 exposures of the Three Forks formation in the Randolph quadrangle 

 in northern Utah, with red shaly limestone (Member 19 ?) as the 

 most conspicuous element in the float. The fauna collected by 

 him from this formation, and identified by Kindle, indicates a 

 mingling of Ouray and Three Forks species. Five 3 of the 7 species in 

 Richardson's list occur also in the Devonian fauna of the Ouray 

 limestone in Colorado, 4 and 6 5 of the 7 occur in the Three Forks 

 formation of the type area. 



Haynes 6 has noted the probability of a correlation between the 

 Three Forks and the lower (i.e., the Devonian) part of the Ouray. 

 Of 25 species and varieties of brachiopods listed by Kindle 7 from 

 the latter horizon, and of 27 listed by Haynes 8 from "Bed 5" (part 

 of Member 20 of this paper) of the former, there are 1 1 which occur 

 in both lists. 



1 Op. cit., pp. 21, 28. 2 Op. cit., p. 412. 



3 Camarotoechia cf. contracta, Productella coloradensis , Schizophoria striatula var. 

 australis, Spirifer whitneyi var. animasensis, and Spirifer notabilis. 



4 E. M. Kindle, "The Devonian Fauna of the Ouray Limestone," U.S. Geol. 

 Survey, Bull. 3Qi (1909). 



5 C. contracta, P. coloradensis, S. striatula var. australis, S. whitneyi var. anima- 

 sensis, Syringothyris cf. carleri, Clciothyridina sp. 



6 Op. cit., p. 24. 



?E,M. Kindle, "The Devonian Fauna of the Ouray Limestones," U.S. Geol. 

 Survey, Bull. 2Qi (1909), p. 12. 

 8 Op. cit., p. 25. 



