344 GEOLOGY OF THE DENVER BASIN. 



Southward from the tributary of Coal Creek mentioned the coal 

 outcrop passes across the higher lauds an undeterminable though probably 

 short distance, when the southern extremity of the syncline is reached, 

 the measures bending downward and passing beneath the prairie to their 

 normal position. 



Folds in the southeastern rim of the syncline. The Southeastern IMlll of the David- 



sou syncline, in the vicinity of the tributary of Coal Creek mentioned 

 above and in the mesa separating it from the Lake basin, presents, in 

 a number of longitudinal flexures, a structure that is the counterpart 

 of the single fold in the region of Burnt Knoll in the northern part of 

 the syncline; a crumpling in the trough or the sides of the syncline has 

 been effected in both localities. In the area, now under consideration, 

 from the eastern edge of the main synclinal trough described above the 

 strata bend gently over and downward to the cast, rising a little beyond, 

 prior to again assuming an easterly dip and becoming the western side 

 of the shallow Eggleston trough which separates the Davidson from the 

 Coal Creek syncline along their southern halves. The strata outcropping 

 along the east side of the Lake basin are also crumpled, to become 

 finally part of the system of folds to the south. The coal measures occupy 

 the troughs of the several folds, but, in part at least, are eroded from the 

 intervening anticlines. The foregoing structure may be observed in the 

 southern walls of the Lake basin, and again, somewhat modified in 

 the amplitude and number of the folds, along the tributary of Coal Creek 

 to the south. In this latter locality there seems to be but a single strongly 

 pronounced anticline, which, although dividing the general syncline into 

 the two subordinate troughs, would, but for a gentle rise and drop to 

 the east, directly separate the Davidson trough from the Eggleston depres- 

 sion. The anticline attains its maximum development about a low knoll 

 just south of the gulch and a little below the abandoned coal-opening 

 already referred to. The knoll is a dome-like outcrop of the basal sand- 

 stones of the Laramie, with an encircling rim of the coal measures dipping 

 rather sharply away in the northwest and southeast directions and gently 

 in the northeast and southwest. The coal itself nowhere presents an 

 outcrop except at the abandoned mine already noted. East of the anticline 



