ANTHRACOLITHIC ROCKS OF KANSAS 151 



is the statement that "Les Marion beds du Kansas, a Bakewellia 

 et Pseudomontis, sont peut-etre de cet age, ainsi que les schistes de 

 Wellington."^ Under that of the Thuringien it is stated that "Les 

 couches de Cimarron, qui font partie des red beds et surmontent 

 I'assise de Wellington, renferment dans 1' Oklahoma des lits a Pleuro- 

 phorus et Bakewellia. II s'y trouve du gypse et des dolomies."^ 



On the "Carte Geologique de I'Amerique du Nord," compiled 

 by Bailey Willis and published in 1906 for distribution at the tenth 

 session of the International Geological Congress in September of 

 that year in Mexico, the areg, of the rocks under discussion extend- 

 ing from southeastern Nebraska southwesterly across Kansas and 

 Oklahoma to central Texas is mapped as Permian, Professor Willis 

 made the following statement concerning it: 



Les couches de la periode Carbonifere sont parmi les plus differentiees de 

 I'Amerique du Nord; on y reconnait ordinairement trois divisions principal es: 

 le Mississippien, le Pennsylvanien et le Permien, et ces divisions sont representees 

 sur la carte autant qu'elles peuvent etre distinguees Le Permien (Forma- 

 tion Dunkard) de la Pennsylvanie n'est pas represente separement. Le Permien 

 du Nouveau Brunswick est montre sur la carte ainsi que la large zone de gres 

 permiens et de couches rouges qui s'etend vers le sud-ouest, depuis le Kansas 

 jusqu'au Texas. ^ 



Professors Chamberlin and Salisbury fully accept the Permian 

 age of the Kansas deposits as is shown by the following excerpts 

 from their magnificent work on general geology : 



West of the Mississippi, the Permian system has a more extensive develop- 

 ment [than to the east], though far less widespread than the Pennsylvanian. The 

 Permian strata are best known in Texas, Kansas, and Nebraska, and though the 

 sea was not entirely excluded from this region, it appears, where present, to have 

 been shallow. Locally and temporarily, inland seas were cut off from the ocean. 

 Early in the period the Texan area of sedimentation seems to have been separated 

 from the Kansan by the beginnings of the Ouachita mountains 



In Kansas and Nebraska the older Permian beds are marine The 



marine Permian of Kansas is overlain by beds containing gypsum and salt and 

 possessing other features which show that the open sea of the region was succeeded 

 by dissevered remnants, or by salt lakes whose supply of fresh water was exceeded 



1 Ibid., p. 1016. 



2 Ibid., p. 1025. 



3 Congres Geologique International, Compte Rendu, Xeme Session, Mexico, 1906, 

 ist fas., 1907, p. 219. 



