122 Raymond — Upper Devonian Fauna with Clymenia. 



the Upper Devonian of South Devon, the Rheinland, and 

 other localities in Europe and Asia, where the top of the 

 Devonian is indicated by one containing numerous species of 

 Clymenia and goniatites. It is to be noticed, however, that 

 the clymenias and goniatites of this American fauna are 

 accompanied by indigenous forms suggestive of the typical 

 Chemung of the eastern sections. f 



The Three Forks shale fauna cannot be directly correlated 

 with any of those now known in the Rocky Mountains. It 

 has a few species in common with the Devonian of the Eureka 

 District, but these seem to be forms which have a long range 

 in the Nevada section and are of little diagnostic value. 

 With the fauna of the Devonian along the Mackenzie River 

 this has little in common, as the fauna described by Whiteaves 

 contains an abundance of corals, while these organisms are 

 almost entirely lacking in the Three Forks shales. 



The Ouray limestone of Colorado, described by Girty, con- 

 tains one or two species found in the present fauna. Spirifer 

 disjunctus animasensis is rather common in both. 



In the uppermost zone of the Three Forks section the 

 presence of Syringothyris and Spirifer disjunctus may prove 

 to be of considerable interest in the correlation of these beds 

 with Eastern sections. Williams* has noted the presence of 

 Syringothyris and Spirifer disjunctus in beds overlying the 

 typical Chemung and underlying the Waverly in southwestern 

 Sew York. On account of the presence of Syringothyris 

 these beds have been referred to the Mississippian. Dr. Girty, 

 who has devoted a considerable time to the study of these 

 strata and their enclosed fossils, has shownf that the fauna 

 indicates a separate time interval, which he calls the Brad- 

 fordian. In this he includes the Cattaraugus, Oswego, and 

 Knapp formations of the New York section, and considers 

 these beds to represent the latest Devonian deposition in their 

 province. 



The fauna of the upper zone of the Three Forks section 

 may, therefore, indicate the occurrence of the Bradfordian in 

 the Rocky Mountains, and serves to confirm the reference of 

 the Clymenia americana fauna to a very high Devonian 

 horizon. 



It is the intention of the writer to continue the study of 

 this fauna, both in the field and in the laboratory, and further 

 work may make possible more definite correlations. 



Acknowledgment is here made to Dr. Holzapfel, of Aachen, 



in appreciation of his kindness in identifying a suite of fossils 



from the red shale zone, and to Mr. Douglass, the discoverer 



of the goniatites, for bringing the locality to the attention of 



the writer. 



Carnegie Museum, Pittsburg, Pa., September 4, 1906. 



*Bull. Geol. Soc. America, vol. xiv, p. 184, 1903. 

 f Science, vol. six, No. 470, Jan. 1, 1904, pp. 24-25. 



