TOURTELOTTE PARK SPECIAL MAP. 111 
shale between it and the limestone. Farther east come in two faults of the 
east-west system, which, on account of the angle of intersection which their 
planes make with the plane of the cross section, seem to have a flat dip to 
the west. Their actual dips, however, are nearly vertical, as can be seen 
on some of the north-south sections, which cut their planes more nearly at 
right angles. Hast of these faults the Parting Quartzite crops at the top of 
the hill) In the gulch on the east side of the hill runs the Copper fault, 
having here its normal upthrow to the east. At about this point the Aspen 
Mountain syneline flattens, preparatory to forming the adjacent anticline, 
and so the outcropping beds pass into the air, giving place to granite 
farther down the hill. The throw of the Ontario fault, however, brings 
down the rocks so that the Silurian dolomite on the east abuts against the 
granite on the west. Below the Silurian dolomite the Cambrian quartzite 
and the granite are again exposed. The last fault shown in the section 
belongs to the east-west system. 
In the block which lies between the Ontario fault and this east-west 
fault last mentioned is a little synclinal basin, which dips in on all sides 
toward the center. 
In this section the thin diorite sheet is somewhat higher up in the 
Cambrian quartzite than in Section A. This sheet also thins out and disap- 
pears toward the west, so that where the quartzite outcrops on the western 
slope of the hill no diorite is found. 
_ Section c—West of Castle Creek fault in this section the Maroon and 
underlying formations are slightly overturned at their outcrop, but right 
themselves almost immediately below the surface, and assume their normal 
succession. In this section the Weber formation comes in definitely and 
persistently in its normal place below the Maroon formation. East of 
the fault the Silurian dolomite outcrops. The dependent faults west of the 
Castle Creek drag up wedges of the underlying formations, so that the 
Leadville limestone nearly reaches the surface at the outcrop of the main 
fault. The throw of the fault is thus greatly diminished, although still 
large. 
Kast of the Castle Creek fault the Saddle Rock fault comes in, having 
its usual downthrow to the east. The next break is the Sarah Jane, which 
has at this point a considerable downthrow to the east, and the next is the 
Justice, whose movement is a downthrow to the west, the reverse of 
