338 



Annals of the Carnegie Museum. 



plains of lakes and rivers situated in a slightly elevated and level 

 rather than mountainous region. 



About two hundred and fifty feet above the level of the Marsh quarry 

 and on the same side of Oil Creek, but three quarters of a mile distant 

 from the Marsh t[uarry there is a thick stratum of chocolate-colored shale 

 best shown in a small rounded butte, locally known as the " Nipple." 

 This butte stands on the crest of the bluff above Oil Creek and is shown 

 in the photographs reproduced in Figs. 3 and 4. It is perhaps 30 ft. in 

 height and is composed entirely of a homogeneous stratum of chocolate- 



FlG. 4. View from near Cope quarry with the " Nipple " in the middle fore- 

 ground and Cooper Mountain in the distance. Garden Park lies between the crest of 

 the bluft', indicated by the line of trees on either side of the "Nipple,"' and Cooper 

 Mountain in a depression about 600 feet below the " Nipple." 



colored shale. This rests on a stratum of sandstone and is capped by 

 another layer of sandstone as shown in the photographs. The_base of 

 this conical hill is about an acre in extent and everywhere about its 

 base the remains of dinosaurs crop out in great abundance. Work has 

 already been commenced at this locality and it is proposed to remove 

 with plow and scraper this entire hill and thus lay bear the bone-bear- 

 ing horizon over a large area. 



