0. Sckuchert — Russian Carboniferous and Permian. 149 



" Our knowledge is much more scanty with regard to the 

 lower series of the anthracolithic system in Spiti, which is 

 situated below the great unconformity. 



" According to Hayden, the total thickness of this series is 

 not less than 5,000 feet in the section above Lio on the Lipak 

 river, where the sequence of the beds is most complete. Two 

 fossiliferous horizons only have been discovered in this mighty 

 sequence " (p. 198). 



The fossils of the "upper horizon," or the Fenestella beds, 

 are not stratigraphically significant, and the little there, 

 considered in connection with the fauna of the lower beds, is 

 rather in favor of regarding it as of Lower Carboniferous age. 



In the lower flaggy limestone horizon (8a of Griesbach) the 

 fossils are " unfortunately, scarce, generally ill preserved, and 

 of a rather indifferent character." Diener thinks the age of 

 the fossils is " more in favor of an upper carboniferous age," 

 but his evidence is completely shattered in the appendix to 

 his work, in a " Note on Spirifer Curzoni, Diener. By H. H. 

 Hayden, Geological Survey of India." This author shows in 

 the most convincing manner that the original generic identifi- 

 cation of Diener was correct and that the species is to be called 

 Syringothyris curzoni. A careful examination of Mr. Hayden's 

 note, his illustrations, and those of Diener, will convince any 

 American student of the Brachiopoda that the form in its 

 general expression and size is to be compared with American 

 forms low down in the Lower Carboniferous series. In further 

 support of this lower Lower Carboniferous suggestion may be 

 cited Spirifer cf. strangwaysi comparable to American S. 

 forbesi. 



Therefore it would seem that the entire 5,000 feet of material 

 beneath the great unconformity may be Lower Carboniferous. 

 The lower portion is certainly so and apparently nearly basal 

 Lower Carboniferous. 



Part IV. The Work of Girty in the Trans-Pecos Region 



of Texas. 



1. The Upper Permian in Western Texas. By George H. Girty. This 

 Journal, Nov., 1902, pp. 363-368. 



2. Report of a Reconnaissance in Trans-Pecos Texas. By G. B Bichardson. 

 "Univ. Texas Mineral Surv., Bull. 9, 1904, pp. 32-45. Fossils determined by 

 G. H. Girty. 



3. The Relations of some Carboniferous Faunas. By George H. Girty. 

 Proc. Washington Acad. Sci., vii, 1905, pp. 1-25. 



The work of this paleontologist on the Carboniferous and 

 Permian of southwestern Texas is best summarized in tabular 

 form, the data being taken from his three papers on the subject. 



Beginning with the highest beds, the facts are as follows :- 



