THE BASIN PROVINCE 127 



fossils in the limestone beds. Correlation, therefore, with this quartzite fixes 

 the age of the quartzite of the Canyon Range as upper Mississippian. 



"The upper Mississippian studied by the writer in the Tintic Mountains 

 north of the Canyon Range and east of the West Tintic Range consists of a 

 thick series of alternating limestone, shale, and sandstone or quartzite beds. 

 The same series, 5,000 to 6,000 feet thick, is present in the southern part of the 

 Oquirrh Range, and is overlain by the thick Bingham quartzite, which has been 

 referred by Girty to the Pennsylvanian series. In the Wasatch Mountains the 

 same intercalated series of limestones, shale, and sandstone is overlain by the 

 Weber quartzite of Pennsylvanian age. These data indicate a transition north- 

 ward and eastward from quartzite into strata composed largely of limestone and 

 shale, and suggest that in late Mississippian and Pennsylvanian time the deposi- 

 tion of siliceous sediment was extended northward and eastward, overlapping the 

 intercalated beds of limestone, shale, and sandstone." 



Granting the equivalence of the quartzite beds in the Canyon Range, 

 the Bingham quartzite of the Oquirrh Range, and the Weber quartzite of 

 the Uintah and Wasatch Mountains brings this formation close to the 

 western and northwestern edge of the Red Beds in Colorado. 



In the Uintah Mountains the Weber formation includes the Weber 

 quartzite at the base. It is described by Weeks^ as follows: 



" Weber formation. — The lower part of this formation is a white and gray to 

 greenish quartzite in thin and thick beds, some of which weather brown. In the 

 upper part of the formation are alternating blue and white siliceous limestones 

 and quartzites. The transition to the next series is through blue and reddish 

 limestones and shales. The greatest thickness occurs on the south side of the 

 Weber River, on the north slope of the range. * * * This formation, like the 

 'Uinta,' is quartzitic in the western and central parts of the range and grades 

 into a rather soft sandstone in the eastern part. No fossils were found in the 

 Weber formation. 



"Permian, Permo- Carboniferous — Nomenclature and correlation. — The Permo- 

 Carboniferous series of the Uinta Range seems to correspond in position, thick- 

 ness, and general lithologic characters to the Upper Coal Measure and Permo- 

 Carboniferous formations of the Fortieth Parallel Survey. On similar grounds 

 they may be correlated with the Aubrey limestone of Walcott's Grand Canyon 

 section. The correlation with Powell's section is less definite. The limestones 

 overlying the Yampa sandstone of the Upper Aubrey group and an undetermined 

 thickness of the shales and soft sandstones of the Shinarump group appear to 

 correspond to the beds under discussion. 



"Description. — The upper beds of the Weber formation are calcareous sand- 

 stones and siliceous limestones which weather yellow and grade into the thin 

 red shales and red and blue limestones of the upper part of the Permo-Carbonifer- 

 ous series. * * * 



"One of the best sections occurs on the east side of Duchesne River below 

 the mouth of West Fork. There the lower 600 feet of the Permo-Carboniferous 

 are formed of the red and purple shales and blue limestones. Above is 1,000 

 feet of light gray and white sandstones, with some interbedded limestones in the 



^ Weeks, F. B., Stratigraphy and Structure of the Uinta Range, Bull. Geol. Soc. Amer., 

 vol. 18, p. 438, 1907. 



