LOCALITIES WHERE THE GROUPS CAN BE STUDIED. 49 



an angle of about 1C degrees. The brown shales and sandstones of the 

 upper group have been stripped from this sandstone over broad areas, and 

 the junction between the two can be plainly seen. Starting from this point 

 and going eastward, a series of gray sandstones above, interrupted by car- 

 bonaceous shales and beds of coal, are passed; then gray and buff sand- 

 stones are seen until the Van Dyke Mine is reached. A little east of this 

 point we come to the base of the Point of Rocks Group, and reach the 

 summit of the Salt Wells Group. I have never examined this point with 

 sufficient care to enable me to indicate the exact junction, but as described 

 in the Point of Rocks Section above, the junction is not very well denned. 



Fine sections can be obtained on either side of the Green River two 

 miles above Flaming Gorge where this group of beds was measured and 

 found to be 2,000 feet in thickness. Here they stand on edge, and their 

 stratification can be well seen. 



The foot of Desolation Canon, and Gray Canon on the Green River 

 affords another fine section, and the group can be well studied in the Wa- 

 satch Cliffs at the head of the Escalante River, and in the hills at the foot 

 of the Pink Cliffs, in Southern Utah. 



SALT WELLS GROUP. 



Standing south of the debouchure of the Point of Rocks Canon into 

 Salt Wells Basin, and looking eastward, lines of cliffs and escarped hills are 

 seen. Climbing these hills until the first massive, light gray sandstone is 

 found, you reach the summit of the Salt Wells Group and the base of the 

 Point of Rocks. Then, turning westward you descend from this eminence, 

 and still continuing in a westerly direction you pass along the foot of an 

 escarpment which faces the railroad, the beds of which dip at an angle of 

 about 8 degrees to the east, and hence you are passing from higher to lower 

 strata. Still continuing 1 in this direction for several miles, and crossing- the 



O 7 O 



broad valley of Pretty Creek, you reach at last the axis of the upheaval 

 near Baxter Section House. Here we find an escarpment facing the 

 north, the rocks of which are light colored, arenaceous shales above and 

 dark, argillaceous shales below. The arenaceous shales are at the base of 

 the Salt Wells Group; the black shales below are believed to belong to the 

 4 P a 



