534 INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



fragmentary imprints of a Halobia (?), and is also probably Triassic. The last two fossils were 

 obtained from Mr. E. Antz, of Ballard Ferry. 



From these data and from what is known of the field relations of the strata it is safe to 

 conclude that a Triassic series is developed on a large scale in this region; but from the paleon- 

 tological evidence at hand it would not be possible to say which one of the numerous subdivisions 

 of the series is present. 



J. P. Smith states " that he visited the Triassic beds of the Blue Mountains in 1908 

 and determined them as certainly of Upper Triassic age (Karnic and lower Noric 

 of Europe). 



L 12. YELLOWSTONE NATIONAL PARK. 



The occurrence of Triassic strata in the Yellowstone Park region is doubtful. 

 Between the Ellis formation (which is now known to contain a Middle and Upper 

 Jurassic fauna) and the Quadrant quartzite (Carboniferous) occurs the Teton forma- 

 tion, which is thought to be at least in part of Triassic age. The section exposed on 

 Cinnabar Mountain in Yellowstone Park is, according to Iddings and Weed.^^^* 



Section of the Mesozoic sedimentary rocks exposed in Cinnabar Mountain and Electric Peak. 





W 



Feet. 

 Dakota conglomerate and sandstone 175 



Reddish shales and impure limestones..' ^ 85 



Limestones and calcareous sandstones, occasionally a conglomerate; carries an abundance of 



fossil remains, which are generally fragmentary near the base 75 



Red argillaceous shale 8 



Gray calcareous shales and impure limestones, characterized by an abundance of fossil remains, 



particularly in the upper strata. The beds are separated near the center by oolitic limestones. . 132 



Green and red shales 50 



Sandstone, saccharoidal in texture, generally light gray or buff in color, but red or brown on 



weathered surface 50 



Red beds, consisting of very fissile sandstones and impure arenaceous clays 75 



Limestone, compact in texture, gray in color, and carrying remains of lingulas 20 



-Limestones, dark gray in color, generally fetid, often arenaceous and frequently characterized by 

 rod-like masses of chert, which are seen to consist of grains of sand embedded in the siliceous matrix, 



the concretions having a white chalky surface 125 



Quadrant quartzites. [These are not a part of the Teton formation and in this table were bracketed 

 with it through a typographic error.] 



In the Yellowstone National Park folio ^®^ the Teton formation is said to be 

 the "probable equivalent of the well-known red beds of Wyoming and Colorado" 

 and is described as follows: 



The formation consists of the basal sandstone, usually dull brown in color and more or less 

 calcareous, characterized by rods and rolls of white chert, and carrying interbedded gray lime- 

 stones containing hnguloid shells. Above this basal bed are gray and greenish calcareous 

 shales, often micaceous and capped by a red arenaceous shale that forms a conspicuous part 

 of the formation. Tliis series of beds is capped by a sandstone, generally bright yellow, with 

 red weathered surface, this rock delimiting the overlying Ellis formation. 



Lithologic resemblances and similar stratigraphic relations suggest correlation 

 of the Teton with the Nugget and other formations of southwestern Wyoming, 

 (See p. 530.) 



" Personal communication. 



