32 



GEOLOGY OF THE YELLOWSTONE NATIONAL PAEK. 



Crowfoot Num- 

 aectiOD. ber. 



(a) 33 23 



f 22 



21 



32 < 



31, 



20 



.13 

 30a, b 12 



29 11 



28 10 



28 9 



28 8 



2 

 26 1 



Bannock Peak section. 



Feet. 



White beds, sandstones and quartzites with interbedded limestone 325 



Limestone, drab, finely crystalline, bard, forms knoll of saddle 100 



Limestone, dense, well bedded, very light gray-brown, compact, weathered 



surface, very finely granular 30 



Limestone, forming great ledge of amphitheater saddle. At the base this 

 limestone is brecciated, being a gray limestone with brown and blue frag- 

 ments. The limestone is generally splintered, the lower two-thirds well 

 brecciated and splintered and weathering in pinnacles, recesses, etc. This 

 weathering is further facilitated by the occurrence of great seams of calcite, 

 4 inches thick, and pockets of the same material. In general the rock is 



finely crystalline, gray, weathering gray-brown 200 



Limestone breccia 10 



Limestone, light gray-brown 15 



Limestone, very finely crystalline, splintery, dense, light gray 15 



Limestone, finely crystalline, brown, weathering same color 20 



Limestone, finely crystalline, very light brown, well bedded and banded. No 



fossils seen 30 



Limestone, coarsely crystalline, massively bedded, splintery, brownish, weath- 

 ering gray-brown ; is fossiliferous, and forms a ledge 50 



Interval 125 



Limestone, coarsely crystalline, brown-gray, weathering a lighter tint. Con- 

 tains fossils 50 



Limestone, white or very light gray, crystalline, compact, massive, not 

 splintered; with small scattered calcite crystals, weathered surface, finely 

 granular. The upper beds are more coarcely crystalline and sometimes 



indurated 165 



Limestone, brown, banded with darker fossiliferous layers, the rest denser; 

 weathers with buff granular surface, often pink or light red. Breaks into 



fragments 2 to 8 inches across 30 



Limestone, brown, fissile, contains fossils 6 



Limestone, dense, bine-gray mottled with buff-brown, with occasional thin 



layers of coarsely crystalline limestone 100 



Limestone, fissile, purple-red, fossiliferous, and resembles the limestone of the 



saddle of Antler Peak : 5 



Limestone, brecciated, fragments sparsely scattered, fossils abundant 5 



Limestone, crystalline, gray, crumbly, containing fossils, weathers gray and 

 exposes fossils and crinoid stems. Beds 2 to 6 feet thick, and strike jointed. 

 Becomes darker and more finely crystalline near top. Strike, S. 70° W. ; 



dip, 8° N 80 



Limestone, cherty, crystalline, gray-brown, weathers light with finely granular 



surface, sometimes pinkish, the chert weathering a rust color 25 



Limestone, crystalline, cherty, gray, thinly bedded (2 to 6 inches) ; few crinoid 

 stems; blue chert; fossils more abundant in upper layers. Slope of beds, 



7°NW 125 



Interval, probably a blue limestone, crystalline, dense 50 



Limestone, crystalline, light gray and gray, very arenaceous, somewhat 

 granular, with rough, pitted, and honeycombed weathered surface. This 

 bed underlies any seen in the east face of Bannock Peak 60 



a Quadrant quartzite. 



