STRATIGRAPHIC SECTIONS IN UTAH AND ARIZONA. 



69 



rently the same interval contains, besides a basal 

 conglomerate unit 15 feet thick, the coal-bearing 

 unit,400feet thick; marine shale, 700feet; sand- 

 stones and shale, 1,000 feet, overlain by a thin 

 conglomerate ; and 700 feet of fresh-water sand- 

 stone, apparently all Cretaceous. 



The pink sandstone and shale series is be- 

 lieved from its position and character to be 

 equivalent to the Tertiary rocks of the Pink 



Cliffs. 



LOCAL SECTIONS. 



1. Section in Bads Canyon, Ariz. 



\Upper part measured at mouth of Robesons Canyon; lower part 

 measured alonj^ Hacks Canyon from Robesons Canyon to the point 

 where it joins Kanab Canyon.] 



Kaibab limestone: 



Harrisburg gypsifernus member: Feet. 



Conglomerate, brown, of waterworn peb- 

 bles 1 inch in diameter; may be post- 



Mesozoic material _ 



I^imestone, yellow, arenaceous; weath- 

 ers "sun-cracked." Silicified fossils 

 on surface, including Leda obesa, Avi- 

 culipecten' sp . , Plagioglyptacanna, Bu- 



canopsis aff. B. bella 8 



Concealed interval -1 



Sandstone, >ellow, calcareous, and are- 

 naceous limestone, with red chert and 



silicified fossils 25 



Concealed interval 8 



Limestone, impure, yellow. With units 

 above is the ' ' BelUroplion limestone. " . 4 



Gypsiun 18 



Sandstone, light gray, calcareous 5 



Limestone, with fragments of white 

 chert that breaks into flat pieces, mak- 

 ing up over half the bulk 13 



Limestone, mth white chert; fossilif- 



erous 11 



Limestone, with small chert nodules. ... 2 



Limestone, arenaceous, yellow on weath- 

 ering, white on fresh surface; more 

 calcareous toward the top, more sandy 

 and friable toward the base; resistant 



and ledge-forming 10 



Gypsimi , . 80 



Thickness of Harrisburg member. 190 



Limestone, thin-bedded abo\'e, with much 

 white chert; massive in middle, with 

 much dark chert, which weathers brown 



or black; thin bedded in lower part '.MT> 



Gypsimi, impure 125 



Limestone, gray, massive; upper part cherty 

 and relatively thin bedded, the chert nod- 

 ules white and fossiliferous; beds of main 

 part 1 to .3 feet thick; lower part grades 

 down into sandstone, which is gray on 

 weathered surface, white on fresh surface. 180 



Limestone, thin bedded , not sandy 20 



Thickness of Kaibab limestone 8-30 



Coconino sandstone: Feet. 



•Sandstone, dark buff, locally salmon-col- 

 ored, massive, cross-bedded, friable, me- 

 diiun to coarse grained 33 



Sandstone, massive, medium grained, highly 

 cross-bedded, friable, white, saccharoidal; 

 a conspicuous unit. Along the strike this 

 and the overlying unit may vary in rela- 

 tive thickness, so that the lower is four 

 times as thick as the upper 44 



Sandstone, massive bed with three distinct 

 layers — a white massive cross-bedded 

 sandstone with streaks of brown, 8 feet; 

 hard brown sandstone, 2 feet; white argil- 

 laceous sandstone, 2 feet. Distinct from 

 overlying unit in not being as white nor 



as friable 12 



Thickness of Coconino sandstone 89 



Supai formation : 



Sandstone, massive, brick-red, witi inter- 

 bedded lenses of red shale; forms a cliff, or 

 at least a steep slope 200 



Sandstone, argillaceous, brick-red, and red 

 sandy shale, interbedded, in about c((ual 

 amounts 350 



Sandstone, massive, brick-red, argillaceous; 

 weathers into rounded ledges; one con- 

 spicuous white band and several minor 



ones. Base of unit not seen 525-|- 



Thickness of part of Supai formation 

 observed 1, 075 



3. Section in Toroweap Canyon, Ariz. 



[Upper part measured .5 miles above mouth of Toroweap Valley; lower 



part at the mouth.] 

 Kaibab limestone: 



Harrisburg gypsiferous member: Feet. 



Limestone, yellow, with silicified fossils at 



top of unit; concealed interval in middle; 



at base limestone tilled with wliite chert 



that breaks into flat jilates. "BMero- 



phon limestone " 65 



Gypsum 38 



Limestone, dark blue 12 



Gypsum 27 



Limestone, impure 8 



Gypsum 40 



Thickness of Harrisburg member. . . 190 

 Limestone, massive, cherty, forming a series of 



steps 25 



Limestone, gray, massive, with much dark- 

 brown chert; forms cliffs and towers 160 



Gypsum 175 



Limestone, weatheiing wliite and hackly and 



forming steps 50 



Limestone, gray, forming steps 50 



Limestone, massive, fossiliferous throughout. 

 At top blue, crystalline, cherty; grades 

 downward into sandy limestone, locally a 

 calcareous sandstone, fine grained ; base 



argillaceous 100 



Limestone, rather thin bedded, with nodules 

 of dark chert, breaks with conchoidal frac- 

 ture 25 



Thickness of Kaibab limestone 775 



