250 



E. C. CASE 



party worked its way into the valley of Mott Creek and followed 

 down the creek to Conleys Peak near White Flat. This creek 

 heads in the Tertiary, producing a very rough topography of char- 

 acteristic Tertiary bad lands ; below this is a wide terrace of coarse 

 gravel and conglomerate carrying water-worn Cretaceous fossils. 

 Below the terrace is a series of red clays and sandstones, the latter 

 much cross-bedded and disturbed; in certain local layers of limy 



Fig. 3. — Triassic beds on Salavito Creek. Gray clays and sandstones capped 

 by heavy gray and red sandstone. 



material Unios and fragments of Phytosaur bones were found in 

 the sandstone, determining the Triassic age of the beds. On 

 descending Mott Creek the disturbed Triassic beds are seen to lie 

 upon a series of red clays, very dark in color and evenly bedded, 

 very similar in appearance to ttie Double Mountain beds farther 

 east and south. The physical characters are far from being a 

 dependable character for correlation in the Red Beds, but taken 

 in connection with the sudden change in character, the striking 

 unconformity, and the correct stratigraphic position these are very 

 probably the same, Double Mountain, beds as seen east of Spur. 

 From Mott Creek the party again ascended to the surface of the 



