EXTENT OF THE DENVEK. 193 



outcrops are rare and many possible variations may be concealed by the 

 heavy Pleistocene deposits of the region. The south slope of the hill 

 mentioned above is covered and the Arapahoe may run from the wesl 

 farther down Ralston ('reck than has been indicated; indeed, the hill may 

 he capped by an entirely isolated patch of the Denver strata. This docs 

 not seem at all probable, however. 



Denver and vicinity. — Within a radius of 4 miles from the city hall in I >enver 

 there an- a great many spots where the strata of the formation bearing 

 the name of the city are well shown, and while one should go to Table 

 Mountain to gain a first acquaintance with these horizons some of the 



exposures within the city limits are very good illustrations of some of 



the chief features of the series. 



The best exposures are on the west bank of the Platte at numerous 

 points in the small drains which enter the river between Overland Park 

 and ( Hear ( 'reek. 



In the largesl of these tributaries which heads on the eastern slope of 

 Green Mountain and enters the Platte near the Larimer street bridge then- 

 are many good outcrops within a mile of the river. In these rocks Mr. 

 Cannon found the skull of Crntfojis n/fiion/is, the first of the horned 

 dinosaurs described by Professor Marsh, associated with other vertebrate 

 remains. 



Still nearer the city, in the ravine l>v the old St. Luke's Hospital, 



Highlands, there was formerly a. very g 1 outcrop of Denver sandstones 



and clays, with cross-bedding structure, and full of plant remains in certain 

 layers. Here, too, occurs a thin local seam of coal, which has from time 



to time Keen rediscovered and announced in the papers as indicating the 

 presence of valuable coal in North Denver. In these same strata Mr. T. \V. 

 Stanton found some molluscan remains, associated with plants, and a small 

 but perfect crocodile tooth. This ravine has now been tilled in grading 



streets. 



At various excavations and cuttings at and about the (.lobe smelter 

 the Denver sandstones have been well exposed. On the western bank 

 of the Platte a good outcrop occurs at water level, at the fool of Thirty- 

 seventh street, and another at Twentieth street. Close by the waterworks 



jiox xxvii 13 



