48 



E. HUNTINGTON-J. W. GOLDTHWAIT 



ure and a somewliat doubtful correlation with formations in 

 neighboring provinces. To these lithological divisions he 

 assigned the time-names "Permian," "Trias," and "Jura." 

 Since, therefore, these names given by Button apply to arbi- 

 trary divisions instead of formations known to represent the 

 three geological periods, Permian, Triassic, and Jurassic, we 

 prefer not to adopt them, but to use only local names for those 

 formations whose exact age is questionable, retaining the one 

 already in use — Shinarump — and applying new names to others 

 of the series, as shown in the following table : 



Eocene Tertiary 



Cretaceous 



Jurassic (of Dutton) 



Triassic (of Dutton) 



Permian (of Dutton) 



Carboniferous 



( Conglomerate 

 I pink sandstone 

 / and limestone. 



Yellow sandstones and 



shales. 



-A White sandstone 



f Red sandstone 



I Red sandstone 



/ and shales - 



■A Conglomerate 



Chocolate sandstone 



Red and white shales 



Red shales. ) 



Gray sandstones and shales ) Lower 



Red shales - - - ) Verkin. 



Variegated shales and 



cherty limestone - Super-Aubrey. 



Gray limestone - - - Aubrey. 



Colob. 

 Upper Kanab. 



Lower Kanab. 

 - Shinarump. 



Upper Verkin. 



SEQUENCE OF EVENTS IN THE TOQUERVILLE DISTRICT SINCE THE 



EOCENE PERIOD. 



From Carboniferous to Eocene time, the history of the region 

 is one of essentially continuous deposition, during which sedi- 

 ments accumulated in an almost unbroken series to a thickness 

 of more than 7,000 feet. In contrast to this long period of accu- 

 mulation, the post-Eocene history is one of vast changes — of 

 tectonic movements that preceded and accompanied the Colo- 

 rado Plateau uplift, of volcanic activity, and of profound erosion 



