C. Schuchert — Russian Carboniferous and Permian. 29 



Art. YII. — The Russian Carboniferous and Permian com- 

 pared with those of India and America. A Review and 

 Discussion • by Charles Schuchert. (With Plate I.) 



Contents : 



Part I. The Work of Tschernyschew. 



Part II. The Work of Noetling. 



Part III. The Work of Diener. 



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



Part I. The Work of Tschernyschew. 



Die Obercarbonischen Brachiopoden des Ural und des Timan. Von Th. 

 Tschernyschew. Mem. du Comite Geol., vol. xvi, 1902 [1903], pp. i-viii, 

 1-749, and 63 plates. 



This large and exceedingly valuable monograph describes the 

 brachiopods collected by the author and others during eight 

 years in the Ural and two years in the Timan districts of 

 European Russia. The great number of 213 species are de- 

 scribed, and two new genera — Keyserlingina and Spiriferella. 



In the present review of this monograph, the author's gen- 

 eral conclusions regarding the occurrence of these forms in 

 the various horizons and their significance in correlation only 

 will be taken into account. In fact, Tschernyschew's correla- 

 tions are of the first importance, and will be fully presented 

 here. 



In the introduction the author states : — 



" It is my opinion that the exceptional richness of the fauna 

 of the Upper Paleozoic sediments of Russia and the positive 

 succession of the various horizons give us the right to regard 

 eastern and northern [ European ] Russia as the starting point 

 for the correlation of similar deposits in other countries. . . . 

 Not infrequently my views differ from those of my colleagues 

 in western Europe and America, and in recording these con- 

 clusions in the final chapter of my work my chief object has 

 been to present the views of one geologist who in the course 

 of many years has studied the upper Paleozoic deposits in the 

 vast territory of Russia. It is very probable that some of my 

 freely-stated assertions will be strongly criticized by geologists 

 both at home and in foreign countries, and I shall be the first 

 to greet such criticisms with pleasure" (pp. vi, vii). 



Of the 213 species of brachiopods known in the " Upper 

 Carboniferous " of Russia, 61 pass into the Artinsk zone and 

 but 10 into the typical Permian. The latter are Dielasma 

 elongatum, Rhynchopora nikitini, R. variabilis, Camaro- 

 phoria crumena, C.superstes, C. globidina, Athyris jpectinifera, 

 A. roissyi, Spiriferina cristata, and Productus aff. leplayi. 



