RESUME OF LITERATUEE. 43 



piaii. Both Mount Agassiz and the upper Bear River Valley, where the crinoid 

 column was obtained, are situated in the western part of the Uinta Mountains, but 

 Geode Canyon is in the eastern part. Thus the paleontologic evidence is, as far as it 

 goes, confirmatory of the stratigraphic correlation of the Uinta sandstone (at least in 

 pai't) with the Weber quartzite. Inasmuch, however, as the AVeber quartzite has a 

 thickness of only 5,000 feet, while the Uinta sandstone measures over 12,000 feet, it 

 would seem probable that the latter includes more than the Weber beds. 



At two points in the western end of the Uintas, fossils are cited from beds just 

 above the Weber quartzite. King .says:" "From the foothills of the range, near 

 Kamas Prairie, were obtained, at a point evidentlj" not far removed from the contact 

 with the Weber formation, Prodmctus semireticulatus, 8piriferina pulchra, Martmia 

 linKcita^' Spiriferina jyiilclira is a peculiar form whose position should not be far 

 above the top of the Weber, so that the faunal evidence confirms that derived from 

 stratigraphy. Again, at Rhodes Spur, from the base of the Upper Coal Measure 

 series, not far above the Weber beds, were obtained ^ Chonetes gra/nulifer, Martinla 

 lineata, Syringopora multattenuata^ Zaphrentis, LitJiostrotion, and Euorivplialus. 

 This list apparently indicates an Upper Carboniferous horizon, but recent collec- 

 tions made from this locality and hoi-izon contain species which determine its, 

 age as Lower Carboniferous, and identify the horizon as the lower part of the 

 Wasatch limestone. If the list cited bj^ King be considered in the light of this fact, 

 it becomes evident that Chonetes granulifei\ which is without doubt a misidentifica- 

 tion, is really the only characteristic Upper Carboniferous form, Syringopora, 

 Zap]irentis, Litliostrotion, and Etiomphahis being rather indicative of the lower 

 Wasatch, where they are common. It would appear, therefore, that in the western 

 Uintas there are two siliceous series so similar lithologicallj^ that they were mistaken 

 for the same in the rapid reconnaissance work of the King survey. One of these is 

 very probablj' the Weber formation, as, indeed, King identifies it. The other is 

 without much doubt pre-Wasatch in age, and represents the Ogden quartzite or some 

 of the Cambrian quartzites, or both, wholly or in part. It is evident that the 

 Wasatch lime.stone (the supposed upper Coal Measures of ono outcrop) must 

 intervene between the two supposed exposures of Weber quartzite. 



The 12,000 feet of Uinta sandstone of the eastern Uintas is suggestive, by reason 

 of its thickness, siliceous character, and stratigraphic position, of the Cambrian 

 ([uartzites, sandstones, and shales of the Wasatch section, which have a combined 

 thickness of about 13,000 feet; but as the Cambrian of central Colorado, which is 

 presumablj^ a continuation of that in Utah, has a thickness of less than 1,000 feef^ 

 it would be natural to suppose that in the Uinta Mountains the Cambrian would be 



" U. S. Geo). Expl. 40th Par., Kept., vol. 1, 1878, p. 147. 

 Mbid,, p. 146. 



f Probably GOO feet in Peale'a Eagle River section is ttie maximum. Tiie thickness averages from 400 to 200 feet, and 

 ranges to complete absence. 



