KAIBAB STRUCTURE CONCOMITANT FORMS. 15 



5. Projecting Jtidf/cs. It is seldom, perhaps never the case that the 

 strata of one of these plateaus are left by the general displacement in a hori- 

 zontal position ; but every block is tilted more or less, and often a valley 

 appears at the foot of the slope, and the streams which head on the opposite 

 brink of the plateau have excavated valleys, leaving intervening ridges 

 which project into the valley, having an effect somewhat like that described 

 as one of the concomitant forms of the Uinta structure. On 2 



6. Cliffs of Erosion. An inclined plateau may be bounded on the 

 upheaved side by an escarpment of erosion, and such an escarpment is 

 gradually carried back by an undermining process from the line of greatest 

 upheaval. The drainage of such a plateau is usually from the brink of 

 this escarpment toward the valley on the opposite side ; yet a minor 

 drainage is found which carves out deep gulches, and the cliffs of erosion 

 have deep reentrant and sharp salient angles. 



7. Buttes. Sometimes the gulches which form the deep, reentrant 

 angles of a line of cliffs have lateral gulches, which by continued erosion 

 coalesce, and the salient angles are gradually cut off from the escarpment, 

 which is ever retreating. In this manner buttes are formed as outliers of 

 cliffs. 



8. Cameo Mountains. Wherever considerable areas of horizontal or 

 nearly horizontal strata are found sufficiently elevated above the base level 

 of erosion, and such areas are drained by two or more subparallel water 

 courses, the lateral drainage of these water courses will gradually inosculate 

 in their upper ramifications, and, carving out deep channels, will leave 

 behind mountains of horizontal strata. Such mountains are often of great 

 beauty. This is especially the case where the beds are of different texture 

 and color, when the mountains will be terraced and buttressed in beautiful 

 regularity, and banded with the colors which are characteristic of the several 

 beds of which they are composed. 



A few miles north of the Uinta Mountains, on the west side of the 

 Green River, a group of such mountains are found, to which I have given 

 the name Cameo Mountains, and I call this the Cameo structure. 



