UINTA MOUNTAINS RECAPITULATION. 201 



that displacement, degradation, and sedimentation were in a general way 

 simultaneous and continuous up to the close of the Bridger period, but 

 interrupted by many minor cessations in the progress of displacement and 

 some cessations in the progress of deposition, and that between the Bridger 

 and Brown's Park periods there was a long time when no sediments were 

 accumulated. 



The Uinta uplift in the region of Brown's Park was at one time several 

 thousand feet greater than we have represented it to be, but after the deposi- 

 tion of the Brown's Park beds it fell down that much ; the evidence of this 

 will more fully appear when we have discussed the Yampa plateau, Diamond 

 Peak, the Dry Mountains, and Brown's Park. 



RECAPITULATION. 



We will now recapitulate some of the important conclusions reached 

 in the study of the geology of the Uinta Mountains. First, the upheaval 

 began at the close of the Mesozoic Age, and continued with slight intermis- 

 sions until after the Bridger period, and the total amount of upheaval in the 

 axial region was more than 30,000 feet. The region was upheaved partly as 

 an integer and partly as a body of minute parts. Second, pari passu with 

 upheaval degradation progressed, and in some places along the axial portions 

 of the region this degradation amounts to more than 25,000 feet, and the 

 mean degradation is three and one-half miles, and from the entire area there 

 has been a total degradation of 7,095 cubic miles. While we have no 

 means of determining any absolute rate of degradation, we are led to con- 

 clude that a maximum rate was not established ; that, as upheaval was slow, 

 degradation was slow. Third, pari passu with displacement and degrada- 

 tion in the region of uplift, there was sedimentation in the region of down- 

 throw. This sedimentation was sometimes intermittent over large areas, 

 frequently intermittent along the shore-line zones. These sediments were 

 derived in part at least from the region of uplift, but probably mingled with 

 materials brought from districts not embraced in the region under discussion. 

 On the north side of the mountains the amount of sedimentation was more 

 than 6,000 feet, and where the Brown's Park beds overlap Bridger beds the 

 amount of sedimentation was about 8,000 feet. 



