CHAPTER II. 



THE GREEN EIVER BASIN. 



BY S. F. EMMONS. 



Section I.— PHYSICAL DESCElPTIO^f— Green River Basin— Uinta Eange. 



Section II. — GENERAL GEOLOGY — The Uinta uplift — Tertiary formations. 



Section III.— DESCRIPTIVE GEOLOGY OF THE BASIN REGION— Wash- 

 akie Basin — Brown's Park and the Yampa Valley-^Vermillion and Red 

 Creek Basins — Cretaceous uplift of Bitter Creek — Volcanic rocks— 

 Bridger Basin — Cretaceous uplift of Oyster Ridge. 



Section IV.— DESCRIPTIVE GEOLOGY OF THE MOUNTAIN REGION— 

 Northern slopes of the Uinta range — Henry's Fork Basin — Red Creek 



ARCH^AN body — OWIYUKUTS PLATEAU — VERMILLION CREEK VaLLEY — 



Region east of the Uinta Range — Escalante Hills and Yampa Pla- 

 teau — Summit region at Lodore Canon and westward — Ashley Creek 

 Basin — Southern flanks of the Uinta Range. 

 Section V. — Tertiaries of tub Uinta Valley. 



SECTION I. 

 PHYSICAL DESCRIPTION. 



Geeen River Basin. — The region represented on Map II comprises 

 tlie southern portion of an enclosed area of Tertiary plains, called, from 

 the river which drains it, the Green River Basin, together with its southern 

 boundary, the great east and west range of the Uinta Mountains ; it includes 

 also, on its southeast corner, a portion of the Tertiary basin of the Uinta 

 River, which forms the northern rim of the great Colorado River Plateau. 



The Green River Basin proper is a rudely triangular area, embraced 

 between the systems of elevation of the Rocky Mountains on the east and 



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