/ ////^yr^vm^^NTA'.- BASIN, 



Fig. 26.7. Tectonic map of central part of Colorado Plateau. Compiled by Shoemaker, 1954. 



412 



>^ 



TERTIARY SEDIMENTS 



DIATREMES 



TERTIARY VOLCANIC ROCKS 



^L 



LACCOLITHS ANO SILLS 



UPPER CRETACEOUS TUFF 



INTRUSIVE MASSES 

 OF SALT ANO GYPSUM 



THICKENED ROLLS OF SALT ANO 

 GYPSUM NOT INTRUSIVE BEYOND 

 NORMAL STRATIGRAPHIC POSITIONS 



STRUCTURE CONTOURS ON TOP 

 CHINLE 



INTERVAL 500 FEET 



