150 CHARLES S. PROSSER 



the Conemaugh, which he had suggested at an earlier date,' and 

 writes as follows concerning it: "The possibility that the lowest 

 Conemaugh reds might mark the dividing line between important 

 formations, such as the true Coal Measures and the Permo-Carbon- 

 iferous, has received strong confirmation during the past year."^ In 

 the chapter on the " Monongahela Series" Dr. I. C. White states that 

 "hence there can be little doubt that this upper two-thirds of the 

 Conemaugh series, together with the deposits of the Monongahela, 

 correlate in time with the Permo-Carhoniferous beds of Europe. "^ 



Mr. Ralph W. Stone has published the following opinion con- 

 cerning the age of the Dunkard formation, which is the one suc- 

 ceeding the Monongahela: 



The organic remains of the Dunkard group, according to David White, com- 

 prise fossil plants in large numbers and ostracods with occasional occurrences of 

 pelecypods and fish fragments 



This flora of the Dunkard is interesting on account of species that are either 

 unique or closely related to forms present in rocks of Mesozoic age.-^ 



Dr. G. C. Martin has recently made the following statement con- 

 cerning the same question: "The equivalents of these beds [Dunkard] 

 in Pennsylvania and West Virginia have, from a study of their floras 

 and faunas, been referred to the Permian series of the Carboniferous. 

 Some doubt still exists as to their age, but in all probability they are, 

 in part at least, Permian."^ 



In the "Tableau du Synchronisme des Assises Permiennes" 

 in the last edition of De Lapparent's Traite de geologie the Permian 

 is subdivided into three etages which in ascending order are the 

 Artinskian or Autunien, Penjabien or Saxonien, and Thuringien. 

 The Kansan formations are correlated as follows in this table: 

 the Neosho and Chase are put in the Artinskian or Lower Permian; 

 the Marion and Wellington in the Penjabien or Middle Permian; and 

 the Red Beds or Cimarron series in the Thuringien or Upper Per- 

 mian.^ Under the discussion of the Penjabien or Middle Permian 



1 W. Va. Geol. Siirv., Vol. II, 1903, p. 256. 



2 Ibid., Vol. Two (A), 1908, p. 622. 3 Ibid., p. 687. 

 4 Geologic Atlas U. S., Folio No. 121, 1905, p. 7. 



s Ibid., Folio No. 160, 1908, p. 8. , 



^ Op. cit., 5th ed., 1906, p. 1026. 



