CARBONIFEROUS AND PERMIAN FORMATIONS I 3 



as belonging to the "Terrain du nouveau Gres rouge" (Triassic 

 system.)' 



Marcou republished this map as a frontispiece of his Geology 

 of North America, \n which occurs the statement that "beds of 

 Nezv Red Sandstone .... cover and form the majority of the 

 immense prairies bordering the rivers Missouri, Platte, Arkansas, 

 and Red River of Louisiana." ^ 



In 1857 Dr. Hayden published a geological map of Nebraska 

 on which the rocks along the Missouri River valley from about 

 fifty miles north of the mouth of the Platte River, south to the 

 Kansas River in Kansas, are colored as belonging to the Carbon- 

 iferous age. 3 The following year Dr. Hayden published a second 

 edition of the above map on which the Carboniferous area 

 remains about the same. To the west of the Carboniferous, the 

 Permian system, which was not indicated on the earlier map, 

 is mapped. This system is represented as beginning at a point 

 a number of miles northwest of Nebraska City and then extend- 

 ing southward increasing in breadth to the southern part of 

 Kansas. The base of the system is represented as crossing the 

 Republican and Smoky Hill rivers several miles west of Ft. 

 Riley, while its upper boundary crosses the Grand Saline and 

 Smoky Hill rivers a number of miles west of the present city of 

 Salina. In Kansas, small areas of Permian are represented on 

 the high divides to the east of the main Permian area. Imme- 

 diately west of the Permian or the Carboniferous where the 

 Permian is absent, rocks are represented that are referred to the 

 Lower Cretaceous.'* 



In 1863 Marcou and Capellini studied the Missouri River 

 section along the eastern border of Nebraska and the 'following 

 January Marcou published quite a full description of the rocks 



'Carte Geologique des Etats-Unis et des Provinces Anglaises de 1' Amerique du 

 Nord. In Bull. Soc. Geol. France, Vol. XII. 



^Op. cit., Zurich, 1858, p. 11. 



3Proc. Acad. Nat. Sci., Philadelphia, Vol. IX, opposite p. 109 and on p. no the 

 description of the area of the system. 



^ Ibid., Vol. X, p. 139. For a statement of the distribution of the Permian, see 

 p. 144. 



