186 GEOLOGY OF THE DENYEE BASIN. 



of these Denver rocks than are found upon North Table Mountain. At its 

 northeastern extremity there is a continuous outcrop, from the basalt down- 

 ward, of about 170 feet of horizontal strata, a description of which has been 

 given. Adjacent to the southeastern point is also a fine exposure of strata 

 below the basalt, and at several places upon the northern and western 

 slopes the more prominent horizons are well shown. Southeast of Castle 

 Rock a, few hundred yards there appears a particularly fine exposure of the 

 most typical conglomerate of the series, at the horizon immediately below 

 the basalt. The footpath from Golden up to Castle Rock also passes over 

 characteristic outcrops, both near the basalt and on the ridge below, at 

 about the 5,950-foot contour. Lower horizons of typical composition are 

 shown at various places along the irrigation ditch, especially at the western 

 base of Castle Rock. 



Plant remains occur quite abundantly throughout the sandy strata 

 within 300 feet of the basalt and have been found particularly well 

 preserved along the southwestern slope of South Table Mountain. 



All outcrops on South Mountain indicate a practical horizontally for 

 the formation as a whole, although there are some minor irregularities. 

 The basalt sheets, whose source is in dikes between Ralston Creek and 

 Table Mountain, evidently flowed in a direction south-southeast upon the 

 inclined sea-bottom, and the surface upon which they rest corresponds 

 approximately to a definite horizon in the formation. < hving to the greater 

 height of North Table Mountain it seems at first glance as if the present 

 surface in contact with the basalt was more inclined than is actually the 

 case. A careful estimate of the total fall of the surface upon which 

 the basalt rests, from the northern edge of North Table Mountain to the 

 southern edge of Smith Table Mountain, makes it 37T> feet in a distance 

 of •_'(), .")(!(» feet, which corresponds closely to a dip of 1 . 



The western base of the formation. Frolll ('leal' ("reek Southward to Beat' Creek 



the base of the Denver formation has been traced by the following data: 

 In the bed of Kimier Run, the small stream which enters Golden from 

 the southeast, there are several outcrops of importance. The first of these 

 is in the town, just east of the court-house, where louse, crumbling beds are 

 shown which contain much quartz in company with the eruptive material. 



