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REPORT UNITED STATES GEOLOGICAL SURVEY. 



General section of Palaeozoic formations in the Teton district. 



Alternations of more or less arenaceous limestones, sandstones, and gritty shales ; 500 

 and less to 1,000 feet. Permo-Carboniferous division of the Upper Carboniferous. 



Alternations of quartzitic sandstones, gray, more or less cherty limestones, and red 

 shaly layers; 1,000 to 2,000 feet. Upper Coal-Measure division of the Upper Carbon- 

 iferous. 



Generally more or less cherty limestone, with local interpolations of quartzitic sand- 

 stone or siliceous beds, and red arenaceous shales; 1,000 to 2,000 feet, more or less. 

 Lower Carboniferous, including, possibly, several at least locally defined divisions, 

 which resemble similar epochal divisions in the Upper Mississippi region. 



Heavy-bedded buff magnesian limestone, usually weathering in castellated exposures; 

 400 feet and less to 600 feet. In the southwest occurs a local development of light- 

 colored, rough- weathered quartzitic sandstone, 50 feet or more in thickness, appar- 

 ently occupying the place of the dolomitic limestones. Also local developments of 

 drab shales, 100 feet, more or less, occur in this horizon. 



Generally even thin-bedded limestones ; 50 to 200 feet. Upper limestone. 



Shales, more or less arenaceous, with thin indurated arenaceous bands and lime* 

 stone layers ; 200 feet and less. Interchangeable with the above occurs a quartz- 

 ite conglomerate, 50 to 150 feet thick, forming an inter-Quebec horizon of variar 

 ble local aspect. Passage beds. 



Limestone, usually thin-bedded, in places breceiated, rusty-weathered, but quite 

 variable in local appearance and vertical extent; 50 to 200 feet. Lower lime, 

 stone. 



Arenaceous indurated deposits, rusty and dirty-yellow weathered, and sandstone, 

 sometimes glauconitic, but also white and variable, based upon quartzite, also 

 variable in color, laminated and conglonieritic ; 200 to 300 feet, more or less; 



Quartzites, micaceous and chloritic slates, forming heavy deposits several thousand feet in 

 thickness. Developed in the southwest, but apparently absent in the central and east- 

 ern portion of the district. 



Gneisses, various schistose rocks, and granite. 



