528 C. P. BERKEY — STRATIGRAPHY OF THE UINTA MOUNTAINS 



above the so-called Weber. Barring discrepancies in thickness and noting 

 only the succession, the uppermost one of these would appear to corre- 

 spond fairly well to the true " Weber." As the erosion break occurs here 

 at its base, a sufficient cause for its limited development is at hand ; and 

 in point of association with the fossil-bearing strata such correlation seems 

 to the writer more satisfactory, since it avoids the introduction of 12,000 

 to 16,000 feet of unfossiliferous strata in the midst of the Upper Carbon- 

 iferous series. 



In the Wasatch the Carboniferous strata, with the exception of the 

 Weber, are very fossiliferous, especially the upper members. In the 

 Uintas there are unfossiliferous beds to the thickness of from 3,000 to 

 4,000 feet overlying the so-called Weber before coming to the marked 

 fossil-bearing belt. 



In this connection there is a very suggestive statement made by Emmons 

 in his discussion of the western Uintas. After giving the list of fossils 

 found on Rhodes plateau, in the immediate region under discussion, 

 attention is called to the fact that out of the seven species enumerated 

 two seem to indicate Lower rather than Upper Coal Measure group * — that 

 is, elsewhere they are found only below the Weber. It would then be 

 all the more remarkable to find them here 15,000 feet above their usual 

 horizon. 



Mr Boutwell f also reports the finding of three lots of fossils from this 

 limestone. The fossils were determined by Doctor Girty to belong to 

 the lower Carboniferous (Mississippian). Although Mr Boutwell does 

 not mention the fault or the intervening beds between the limestones 

 and the quartzite, he says "it would appear that the great sandstone 

 series is earlier than the lower Carboniferous." 



The quartzite body has furnished no fossils. Three loose fragments J 

 found by the Fortieth Parallel survey were assumed to come from that 

 formation, but as has been pointed out, there are three other quartzites 

 in the Uintas either of which could as well carry fossils. The writer found 

 a spirifer in a loose fragment of quartzite clearly from the uppermost 

 (third) quartzite above the unconformity. It is his conviction, after see- 

 ing these different quartzites many times, that residuary fragments of the 

 upper formations might, in spite of all the erosional activity of the region, 

 still lie far within their present limits on the broad anticline of older 

 rocks, and that there is not necessarily enough lithologic difference in 



*U. S. Geological Exploration of the Fortieth Parallel, vol. ii, p. 313. 

 fU. S. Geological Survey, Bull. 225, p. 224, 1904. 



JU. S. Geological Exploration of the Fortieth Parallel, vol. ii, p. 290. 

 U. S. Geological Exploration of the Fortieth Parallel, vol. i, p. 152. 



