70 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1921. 



Coconino sandstone: Fi>et. 



Sandstone, deep yellow to I)uff, somewhat 



friable but not notably cross-bedded 13 



Sandstone, much cross-bedded, yellow and 

 white, friable; white on fresh surface 70 



Sandstone, pale yellow, fine grained, argilla- 

 ceous; weathers to rounded exfoliated 

 bosses 13 



Thickness of (.'ocouino sandstone 96 



Supai formation: 



Shale, gray, sandy 14 



Sandstone, red, somewhat argillaceous but 



massive and forming a steep slope or cliff. ... 175 



Sandstone, argillaceous, and sandy shale; both 

 brick-red and interbedded in about equal 

 amounts; forms a slojie 375 



Sandstone, massive, red 735 



Thickness of Supai formation. 

 Redwall limestone. 



1,299 



3. Section on Fredotiia- Mount TnimhnU roml half a mile 

 northeast of Bnllrush, 1J\ mile^ souttnrext of Fredonia, 

 An:. 



Moenko])i formation: 



Shale, white, calcareous, an< 



in thin plates 



Shale, red 



Shale, gray 



imjuirc limestone 



Virgin limestone memlier: 



Limestone, earthy, yellow, with many 

 small cavities lined v\'ithcalcite. Thick- 

 ness ranges from 1 to 2 feet 



Shale, gray 



Gypsum, red to gray 



Shale, red 



Limestone, thin bedded, earthy, yellow; 

 fossil fragments 



Thickness of Virgixi limestone mem- 

 ber 11 



Shale, red, exposed 25 



4. Section in. Hurricane fault scarp in Blarl- Rock Canyon, 

 Art:., IS miles south of Hurricane, Utah. 



Kaibali limestone: Feet. 



Limestone, gray, cherty, massive; inaccesible 



for measurement . 



Gypsum, shale, and some limestone 225 



Limestone, gray and lirownish on weathered 



surface, light gray on fresh surface; cherty. 



Unit massive except foi- uppermost 22 feet, 



which is thin bedded 190 



Sandstone, gray, fine grained; weathers lirown. 5 



Gypsimi 15 



Limestone, thin bedded, gray W) 



Gypsum 20 



Limestone, thin tedded, dark gray 7 



Gypsum 45 



Thickness of part of Kailjab Limestone meas- 

 ured 567 



Coconino and Sujiai formations { undifferentiated ) : ret 



Sandstone, medium grained, gray to white on 

 fresh surface, yellow-l>rown on weathered 

 surface, medium bedded, cross-bedded 200 



Sandstone, like that above but in thinner 

 beds separated by softer brick-red sand- 

 stone. A few layers dark gra>- and smell- 

 ing of oil when broken 490 



Sandstone, medium grained, cross-bedded, 

 gray to white on fresh surface, yellow- 

 brown on weathered surface; relatively 

 thin liedded and weathering liack from the 

 unit lieneath to form a l)ench , 



Sandstone, like the unit next aljove but prac 

 tically in one lied and forming a sheer wall. 



155 



3S0-I- 



Thickness of jxirt of sandstone exposed 1, 225 



5. Section 2 miles south nf Antelope Spring, on west side of 



Antehipe Wash, Art:. 



Moenkojii formation: 



Shale, red. 

 Unccmformity. 

 Kaibab limestone: 



Harrisburg gyi^siferous member: Feet. 



Limestone, sandy, yello\vish, with much 



white chert; very fossiliferous; weathers 



hackly, with silicified fossils showing on 



surface. Lithology characteristic of this 



])art of the formation 15 



(iy])sum, pink in large part; near middle of 

 unit 5 feet of dark thin-liedded limestone 



with fetid odor when broken 140 



Sandstone, coarse, gray, granular, calcareous; 

 contains fossil fragments 5 



Thickness of Harrisburg member 160 



Limestone, gray, massive, \vith much light chert; 

 whole unit weathers light colored; exposed. ... 40 



6. Section at head of Rock Canyon, 5 miles north of Ante- 



lope Spring, Ari:. 



Top of hill south of Rock Canyon. 

 Moenkopi formation: 



Rock Canyon conglomeratic member : Feet. 



Limestone, pale red, with some gray; weath- 

 ers hackly and with "sun-cracked " surface 



and shows flecks of calcite 30 



Limestone, like unit above but gray 15 



Conglomerate of rounded and subangular 

 fragments of quartz and chert, white to 

 dark gray, as large as 12 inches across, 

 though most are under 5 inches. The 

 matrix is limestone. The bedding of this 

 unit is very irregular, and locally the con- 

 glomerate is interbedded with ordinary 

 limestone. Contains Alyalinau. sp., Mon- 



otis.' sp., Macrocheilina? sp 55 



Conglomerate of fragments of fossiliferous 

 chert and limestone in a matrix of white 

 granular limestone. This unit is more 

 resistant than that below. The unit above 

 cuts down locallv clear through this unit. 15 



