THE OVERTURES IN THE DENVER BASIN 



347 



Mr. H. F, Watts, of Boulder, Colo., who was associated with the 

 writer in this work, will be an effectual aid to an understanding of 

 what seems to have taken place. 



After solving the problem at this point, it was easy to recognize 

 the same phenomenon (which in local field parlance has been desig- 

 nated a "slump") at various points north and south for some distance. 

 It frequently results in the production of a bench similar to the one 

 on Flagstaff, locally known as Huggin's Park, but does not usually 

 result in covering intervening formations on so extensive a scale. 



Fig. 2. Cross-section of east slope of Flagstaff Mountain. 



Whether like conditions exist at all places in the Denver Basin where 

 overturns occur, the writer is unable to say, not being familiar with 

 the foothill region south of the Boulder county line; but the matter 

 is worthy of further investigation before assuming that such over- 

 turns have any bearing upon the theories of mountain structure. 

 The same process that caused the overturns in these cases, has pre- 

 sumably caused the greater dip of the later formations in cases where 

 they have not been overturned. 



Museum, University of Colorado, 

 Boulder, Colo. 



