20 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 'J'] 



scenery in Yellowstone Park. One member of the Cambrian series 

 of beds is always massive and since Soda Butte Creek has cut into a 

 gently dipping fold, this massive limestone rims the valley. Every 

 stream, permanent and temporary, falls over this layer, usually in a 

 very narrow canyon, adding very much to the picturesqueness of the 

 region. Indeed, Cooke City is coming to i>e a favored tourist resort. 

 Immediately above the massive limestone just mentioned, the beds 

 become shaly, and from these were secured an entire Cambrian crinoid 

 of which no complete individual had previously been discovered in 

 rocks as ancient as these. However, the fossils obtained from this 



Fig. 2-j. — Jackson Lake and Mt. Moran. The Grand Teton visible to the 

 south. The dead timber along shore is caused by flooding when dam fills. 

 (Photograph by Resser.) 



excellent section were few in number compared to what might be 

 expected from such a group of Cambrian beds, due to their deposi- 

 tion in shallow water. At many places the rocks are composed almost 

 entirely of fossil fragments which had been ground up by the waves 

 prior to preservation. 



A brief trip was made into the south end of the Gallatin Range, to 

 secure a few fossils in order to determine the relationship of the 

 Cambrian beds present here to those in the Absaroka and Teton 

 Ranges. 



Work was next continued in the Teton Mountains, which are in 

 many respects the most magnificent in the United States, rising as they 



