434 



p. B. WEEKS STRATIGRAPHY OF THE UNITA RANGE 



Pprmo- 

 Carboniferous. 



Weber 

 formation. 



Mississippian 

 Series. 



Ogden 

 qnartzite. 



Lodore Sliale. 



river about two miles below Iron creek, ex- 

 tending from the Lodore shales to the Weber 

 formation at the summit of Ehodes plateau 

 and the Permo-Carboniferous beds exposed 

 on the east side of the river below the mouth 

 of West fork. This section shows the varia- 

 tions in character of Paleozoic sediments, ex- 

 cept as noted hereafter. 



PRB-CAMBRJAN "UINTA" FORMATION 



Nomenclature mid correlation. — The oldest 

 sedimentary strata of the Uinta range were 

 named and defined by Powell as the Uinta 

 sandstone. King applied to this series the 

 name Weber qnartzite, considering that it 

 corresponded in stratigraphic position with 

 the Weber quartzite of the Wasatch moun- 

 tains. It has recently been decided (10) to 

 retain the name Uinta for the Tertiary strata 

 which forms the plateau region east of the 

 Wasatcli and south of tlie Uinta ranges. The 

 decision was made on the grounds of jsriority 

 and general usage. JSTo new geographic name 

 is jjroposed for this fof-mation, leaving the 

 question of nomenclature for future discus- 

 sion. In this connection it may be stated that 

 it is believed not to be the best practice to 

 retain a name indefinitely applied and used 

 for general description where the same name 

 has been applied to and adequate description 

 given of another series of strata to which the 

 name is more applicable. King states (3, 

 page 407) : "Uinta group was a term 

 stretched for convenience to cover all the 

 Tertiaries south of Uinta range of whose true 

 subdivisions Ave were ignorant." The name 

 Uinta as applied to the Tertiary strata of the 

 Duchesne drainage area is a misnomer, while 

 no one would question its application to the 



Scale gTcat thlckness of quartzite and sandstone 



1000 1500 forming the surface rocks of the Uinta range 



^'^''mJr^ltTl'ronCrlT''' for approximately 2,000 square miles. 



Pre-Cambrian. \ 



