22 



GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Crowfoot 

 sectiOD. 



31 



30a, 6 

 29 



27, 28 < 2 



Num- 

 ber. 



31 



125 



23 

 22 



26a 



24 



21 

 20 



Antler Peak section. 



Limestone, crystalline, moderately dense, brown, weathering grayish, with 

 rough pitted surface, and breaking readily into small angular pieces. Dip, 

 N. 50°E.,20 3 



Limestone, less splintery than bed above, light brown, fissile, with fossil layers. 



Limestone, finely crystalline, light gray with buff or pink, finely granular, 

 weathered surface. Very fissile, plates warped 



Limestone, brown or purplish brown, very fissile and platy. Fossils abundant. 



Limestone, massively bedded, light drab and brown, breaking readily into frag- 

 ments. Fossils somewhat abundant. Dip, 5 U NE 



Limestone, finely crystalline, light and dark gray and gray-brown, weathering 

 buff, with smooth, finely granular surface. Layers thickly and thinly bedded, 

 with very fissile fossiliferous strata near base 



Limestone, mottled, massive, and seamed with calcite. Lenticular arrangement 

 of light-brown in darker mass gives appearance of bedding 



Limestone, very fissile and containing fossils 



Limestone, massive, purple, containing white fossil fragments 



Limestone, alternating layers of very fissile, gray, and fossiliferous limestone 

 aud more massive rock 



Limestone, coarsely crystalline, without chert; is fossiliferous and seamed with 



rlcite 



Cherty limestone, forming a prominent ledge shown in Holmes's sketch. Hard, 

 dense, crystalline; contains corals and crinoid stems and much blue chert in 

 bands and nodules. The rock is somewhat seamed with calcite 



Feet. 



100 



40 



15 



100 



50 



100 



15 



5 



15 



170 



50 



100 



'- 





23 19 Limestone, somewhat massive and thickly bedded (5 to 10 feet), light gray, with 

 light, very rough, and irregular weathered surface. Few fossils and a little 

 light-colored chert - 40 



22 18 Limestone; alternating beds of dense light-drab limestone and brown arena- 



ceous sandstone, with rough aud pitted weathered surface and fetid odor, parts 

 of it resembling No. 16 of this section. Extends up to base of cone top. The 



21 rock is an arenaceous limestone, dark brown-gray, weathering brown 130 



® ; 



20 



19c 



% { 



o 

 ,3* 



17 



16 



15 

 14 

 13 



f 



111 



Limestone, compact, dense, hard, dark gray, weathering very light brown-gray, 

 with finely granular surface 



Limestone, dark brown-gray, weathering straw-color and rich brown. Is an 

 arenaceous limestone 



Limestone, white, pitted and rotted, with harder mottled places 



Interval, no exposure 



Limestone, brown, dense 



Limestone, light creamy yellow mottled with gray, thinly bedded, breaking into 

 small cuboidal blocks. Strike, N. 5° W. Dip, 3° W 



Limestone, finely crystalline, white 



15-19S 10 Limestones, grading at top into cherty limestone. 

 14 9 Mottled limestone, but 30 feet exposed 



(11 



IS 



8 Interval, no exposure. 



7 Limestone, finely crystalline, light drab. 



20 



5 



6 



10 



5 



35 

 30 



160 

 50 



