238 GEOLOGICAL SURVEY OF THE TEREITOEIES. 



There has been so much erosion, preceded by glacial action, that the 

 greater part of the beds has been removed. That the section represents 

 the actual condition of affairs is rendered the more probable by the fact 

 that Dr. Endlich found in his district just south of our line the same 

 succession of beds at Promontory Point. Here the succession and order 

 of superposition was more clearly demonstrable. Trout Creek is the 

 second large creek flowing into the Arkansas from the east below Buf- 

 falo Peaks. Crossing the low divide southeast of the salt-works, we 

 find exposures of black shales and conglomerate sandstones dipping a 

 few degrees east of north, and inclining 35° to 40°. Below the black 

 shales we have sandstones and green shales; then we have blue limestone; 

 then there is a space in which all the beds are covered up. The next 

 outcrop is a gray limestone, below which there is a blue limestone. I 

 was unable to get the dip, but it is probably the same as we saw in the 

 beds above. After leaving these outcrops we come into a small park, 

 about five miles in length and over a mile in width. It is a beautiful 

 meadow-like park, in which the underlying beds are almost entirely con- 

 cealed. At the upper end, however, I was able to make the following 

 section : 



Section No. 21. 



In descending order : 



1. Light-reddish gray micaceous sandstone, 50 feet. 



2. Blue limestone, 3 feet. 



3. Yellow sandstone shales, 13 feet. 



4. Light-red micaceous sandstone, 10 feet. 



5. Hard reddisb brown sandstone, 6 feet. * 



6. Gray shales, 4 feet. 



7. Red shaly sandstones, 6 feet. 



8. Fine bluish shale, 5 feet. 



9. Yellowish-brown sandstone, 3 feet. 



10. Bluish shales, 6 feet. 



11. Bed shales, 9 feet. 



12. Brown and red shaly sandstone, 13 feet. 



These beds all dip toward the northeast at an angle of 40°. They 

 correspond closely to the limestones and sandstones seen in sections 

 Nos, 10 and 11, and to those east o± Fair Play below the red beds, and 

 which I have already referred to the Permian. Farther down the 

 creek we find outcrops of greenish micaceous sandstone. These beds 

 are laminated, and between we have fine black shales. The dip 

 is still in the same direction. Below these are blue limestones, and 

 still farther gray limestone. These beds are undoubtedly Carbon- 

 iferous, and a closer search than I had the time to make would 

 doubtless reveal fossils in some of the layers. At the lower end of the 

 park the creek has cut its way through the beds at right angles 

 to the strike, and the beds stand on either side as a high wall, 

 dipping northeast at an angle of 15°. Besting immediately on the 

 granite there is a bed of quartzite. Above this there is a bed of dark- 

 gray limestone, about 200 feet in thickness. Next follows 10 to 20 feet 

 of brown quartzite and then limestone. Above this the beds are cov- 

 ered until we reach the Carboniferous layers already referred to. The 

 quartzite and limestone resting on the granite are evidently the direct 

 prolongation of the beds noticed west of Buf^ilo Peaks. Farther south 

 and southeast, in Dr. Endlich's district, these beds are more distinctly 

 shown, and will be fully treated ot by him. Trout Creek, for the rest of its 

 course, flows through granitic rocks. About two or three miles below 



