170 GEOGRAPHIC DISTRIBUTION. 



of Echo Park resting on Carboniferous beds. Another fragment is found ten 

 or twelve miles west of the Canon of Lodore resting on Carboniferous and Jura 

 Trias beds. A fragment is found west of Brush Creek also lying on the Car- 

 boniferous and Jura Trias beds; and the Wa-ka-ri-chits are capped with this 

 conglomerate, which here rests on Sulphur Creek beds. 



These are the only fragments which I have discovered in the area em- 

 braced on the map, but to the westward, on both flanks of the Uinta uplift, 

 this formation has a much more extensive geographic development and it is 

 also found in greater thickness. On the north side of Connor Basin, at the 

 head of Sheep Creek, this conglomerate has a thickness of more than a thou- 

 sand feet. 



There are some conglomerates on the peaks of the Dry Mountains 

 which at one time I believed to belong to this period, but I now think they 

 are of the Brown's Park age. 



In the destruction arid redistribution of this formation, the materials of 

 which it was composed have been scattered in many places here and there 

 on either flank of the Uinta uplift. The conglomerate is composed of bowl- 

 ders and pebbles of sandstone, quartzite and crystalline schists, but sand- 

 stones and quasi quartzites probably of the Uinta period greatly prevail; 

 but in the original beds and redistributed materials found so abundant north 

 and northeast of Mount Wheeler where the Red Creek Quartzite is exposed, 

 white quartz and crystalline schists are far more abundant than elsewhere. 

 Sometimes at least the cement is calcareous. In the fragment west of Echo 

 Park large and somewhat angular blocks of Uinta Sandstone are found. 



I think that many geologists would ascribe this conglomerate to the 

 action of ice, but throughout all that portion pf the Rocky Mountain region 

 which I have studied, I have so frequently found gravels and conglomer- 

 ates of sub-aerial origin, and have in so many cases found reason to change 

 my opinion concerning them, often having attributed a drift like deposit to 

 glacial action, and*afterward on further study abandoned the theory, being 

 able to demonstrate its sub-aerial origin, and witnessing on every hand the 

 accumulation of such gravels in valleys and over plains where mountains 

 rise to higher altitudes on either side, and having in many cases actually 

 seen the cliffs breaking down and the graveb rolling out on the floods of a 



