520 0. P. BERKEY — STRATIGRAPHY OF THE UINTA MOUNTAINS 



The Fortieth Parallel geologists' discussion of the stratigraphy of the 

 Uintas is based largely on the Wasatch section, while Major Powell's is 

 based chiefly on the Grand Canyon succession. 



The western Uintas 



The writer's most systematic field observations relate to the western 

 Uintas. The area most studied is the vicinity of the headwaters of the 

 Du Chesne river and its upper tributaries. It is believed that the dis- 

 crepancies apparent in this intermediate field, instead of adding to the 

 confusion, really point to a reasonable interpretation of the correlation 

 of the whole series. 



The accompanying observations are therefore offered as additional evi- 

 dence to be used in settlement of disputed questions, or at least as an 

 aid to further work in this field. 



Standard Section — the Wasatch Column 



The standard section for comparison and correlation is that given in 

 the Fortieth Parallel Survey reports for the Wasatch. It will be neces- 

 sary to refer to this so often that a condensed table is inserted here. 



The Wasatch Column 





Formation. 



Thickness. 



Description. 



Permic. 





Feet. 

 500 



Argillaceous and calcareous shales, lime- 

 stones, and sandstones. 



'5 





2,000 



to 

 2,500 



Limestones, cherts, and shales. 



Coal Measure fossils from top to bottom. 



o 

 Xi 

 u 



6 



" Weber" 

 quartzite. 



6,000 



Quartzites extremely variable, red sand- 

 stones at base, shales, and conglomerates. 





11 Wasatch" 

 limestone. 



7,000 



Coal Measure fossils 4,000 feet. 

 Heavy bedded gray limestone. 







Devonic. 



"Ogden" 

 quartzite. 



1,000 



to 

 1,600 



Quartzites with abundant smooth rounded 

 pebbles, conglomeratic. 



Si 1 uric. 



"Ute" 

 limestone. 



1,000 



to 

 2,000 



Limestone. 



a 

 o 





75 

 12,000 



Argillites and shales, micaceous toward 



top. 

 Quartzites and interspersed slates. 







1,000 



Schists and argillites. 



