1918] Moody-Taliaferro : Anticlines Near Sunshine, Wyoming 459 



mations. The "Wasatch formation has been only slightly warped and 

 tilted. 



Quaternary Period. — In Quaternary time streams from the high 

 mountains to the south and west developed broad flood plains and 

 deposited rather thin, but extensive, sheets of silt, sand, and fine to 

 coarse gravel. Uplift, without tilting or folding, or possibly the 

 removal of a barrier far down stream, caused active erosion to begin 

 and the streams to cut down to a new level, removing all but scattered 

 remnants of their old flood plains. New flood plains were formed 

 and a thin sheet of silt, sand, and gravel again deposited. Another 

 period of renewed erosion caused the streams to erode to a still lower 

 level, forming the present stream valleys. 



SUMMAEY 



South and east of Sunshine, Wyoming, are three rather small 

 anticlines, involving the Cloverly formation and the Colorado and 

 Montana groups, whose axes are arranged en echelon, forming the 

 crest of a larger fold. The axis of the most northerly fold, known 

 as the Sunshine anticline, follows a somewhat sinuous course in a 

 general north-south direction, while the axis of the most southerly 

 fold, known as the Gooseberry Creek anticline, trends N 25° W. The 

 northern part of the Sunshine anticline is asymmetric with the steeper 

 dip on the west, while in the asymmetric Gooseberry Creek anticline 

 the steeper dip is on the east. The Mowry shale is exposed along the 

 axis of the Sunshine anticline and the Cloverly formation along the 

 axis of the Gooseberry Creek anticline. 



The Wasatch formation (early Tertiary) overlies the older for- 

 mations with marked unconformity. It has been only slightly warped 

 and tilted. 



Cut terraces covered with Quaternary gravels have been devel- 

 oped along the streams. 



