HINTZE, GEOLOGY OF WASATCH MOUNTAINS, UTAH 125 



In Eed Butte Canyon, the next gulch to the south of Dry Canyon, 

 occurs a heavy conglomerate and a considerable^ thickness of purple 

 sandstone. These purple beds were called Permian by the geologists of 

 the Fortieth Parallel Survey. Overlying them are the strongly cross- 

 bedded red sandstones which form the prominent red cliff at the mouth 

 of the canyon, from which it has derived its name. These are the 

 "Triassic red beds" of Hague and Emmons. The discovery of the 

 Meekoceras fauna several hundred feet below the purple sandstones has 

 carried the lower limit of the Triassic down below what was called Per- 

 mian into those beds which were mapped as upper coal measures by the 

 Fortieth Parallel geologists. The simple synclinal structure for this 

 region shown on the Great Basin sheet of that survey is now also known 

 to be more complicated, including at least one large anticline and an- 

 other syncline to the south of Emigration Canyon. The new geologic 

 map of this region now being prepared by Mr. IST. C. Christensen and 

 Dr. F. J. Pack will look very different from the present one, and it is 

 expected that the separation of the Jurassic, Triassic, Permian and Car- 

 boniferous can be definitely accomplished in this region. For the pres- 

 ent, the interpretation here given (page 126) is thought to be very near 

 the true one. 



