■RESUME OF LITERATURE. 49 



ite" for this series, and emf)loys the term " Uinta group-' as King uses it, for one of 

 the Tertiar}' formations. 



In his table of correlated sections on page 22 White rejDresents the Weber 

 quartzite of his section as being the same as the Uinta sandstone of Powell's, his 

 Lower Carboniferous the same as Powell's Red Wall, his Middle Carboniferous the 

 same as Powell's lower Aubrej-, his Upper Carboniferous , the same as Powell's 

 Upper Aubrey, and his Triassic(?), which lies above, the same as Powell's Shina- 

 rump, Vermilion Cliff, and White Cliff groups. 



Regarding the Lodore group, which Powell described as immediately overlying 

 the Uinta sandstone, White remai-ks: "Furthermore, at all places in this district, as 

 well as within a large area outside of it, the strata of the Lower Carboniferous rest 

 directly upon the Uinta sandstone, those of the Lodore group being absent." (Page 

 23.) And again: "Although the typical localit}" of the Lodore group which Pro- 

 fessor Powell represents as existing at the base of the Carbonifei'ous series and above 

 the Uinta quartzite is near the northern border of the district here reported on, it 

 does not occur within its limits." (Page 20.) If this is indeed the case, an overlap 

 above the Lodore group is indicated, as well as an unconformit}' below' it. 



White was associated with Powell in his geologic investigation of this general 

 region two years pi-eviouslj' (1875), and without doubt the correlation indicated is as 

 accurate as may be. White also correlates his section with that of King, whose 

 report had not then been published, and with whose work he was less closely in touch. 

 He parallels his Weber quartzite with King's formation of the same name, his Lower 

 and Middle Car))oniferous with King's Upper Coal Measures, and his Upper Carbon- 

 iferous with King's Penuo-Carboniferous. The correlation was made relying upon 

 advance sheets of King's maj), unaccompanied by text, and in the case of the Permo- 

 Carboniferous and Upper Aubrey is without doubt erroneous. The Permo-Carbon- 

 iferous of King, as previously remarked, lies above the bed taken by Powell as the 

 top of his upper Aubrey. It is really part of Powell's Shinarump and the basal 

 portion of White's Triassic. Therefore, not only the Lower and Middle Carboniferous 

 of White, but the Upper Carboniferous as well, go to make up the Upper Coal 

 Measures of King, which also includes the Lodore group where present. White 

 assigns the Red Wall a thickness of 2,000 feet, and the upper and lower Aubrey each 

 1,000 feet, in the section on page 76 of Powell's Geology of the Uinta Mountains, and 

 it would appear that the Red Wall and upper Aubrey were of diminished thickness 

 in tlie new area. This is still more striking if the thicknesses in Powell's measured 

 section (2, -460 feet and 1,575 feet, respectively) be considered. The rather marked 

 disparity' between the thickness (2,500 feet) which King assigns to his Upper Coal 

 Measures, and the 5,000 + feet which are contained in the detailed section in Powell's 

 report, has alread}' been referred to. This is somewhat less marked accordinglj^ in 

 14364— No. 16—03 4 



