302 



R. T. HILL — GEOLOGY OF RKD RIVER. 



The southern front of this, mountain region has been the scene of a 

 continued struggle between the land and the marine baselevel of the 

 gulf of Mexico, and in the sediments to be described is recorded the de- 

 tails of this history, and by the aid of which we can interpret many 

 phenomena of the Texan and Mexican region to the westward, the legi- 

 bility of which has otherwise been obscured there by the great orographic 

 and denudative agencies. 



The following beds, occurring in the medial Red river region, have 

 been largely deposited against this old Paleozoic shore : 



Pleistocene and recent 



f Alluvium. 



I Second bottom. 



Neocene '. Plateau gravel. 



Eocene Camden series. 



Upper Cretaceous .. Glauconitic division, 



( Washington. 

 < Brownstown. 

 ( White Cliffs. 

 Taylor marls. 



n 1 J J- • • f Austin chalk. 



Colorado division j Eagle Ford. 



Dakota division Eastern Cross Timber. 



^ Main street . . . ^ 

 Paw Paw ! Denison 



North Denison [ beds. 

 Lower Cretaceous . . Washita division <j Marietta J 



Fort Worth. 

 Duck creek. . 

 Kiamitia .... 



Preston 



beds. 



-u, 1 . 1 1 T • • 1 Goodland 



1* redericks burg division j ^ -, . 



. 1 Comanche 

 . j Peak beds. 



Trinity division , . . 

 Paleozoic Not differentiated. 



( Glen Rose. 

 I Trinity. 



Typical geologic Sections. 



In order to appreciate the multiplicity of geologic formations and their 

 history, both during and after deposition, attention is invited to the ac- 

 companying map and cross-sections in connection with the preceding 

 enumeration. The entire sequence of formations given do not occur at 

 the surface in any one of the profile sections, but the relation of one to 

 another is plainly shown by the parallel profiles. 



