STKATIGEAPHIC SECTIONS IN TTTAH AND ARIZONA. 



75 



Kaibab limestone— Continued. Feet. 



Limestone, gi'ay, mas.sive. resistant, witli much 

 dark chert; contains Baloslnmella sp., Fene- 

 stella sp., Polypora sp., Septopom sp., Pro- 

 ductus ivesi, Piistula subhomdn, Ptistula aff. 

 P. irginae, Pseudomonotis? s^., AvicuHpccten, 

 3 sp., Acanthopectcn coloradoensis, Acanthopec- 

 len? sp ]nn± 



17. Section just off the St. George-Wolf Hole road about 7 



miles north of Wolf Hole, Ariz 

 Top of hill. 



Kaibab limestone: 



Harrisburg gypsiferous member (some of this 

 unit may be basal ])art of Moenkopi forma- 

 tion): Pept. 



Gypsum, red, in thin layers 1.5 



Gypsum, white IS 



GyiJsum, red, with a little red shale 5 



Gypsum, white to pink 10 



Limestone, white, with little or no chert. . 2 

 Sandstone, brown to yellow, eoft, and gyp- 

 sum 7 



Limestone, yellowish, filled with white 



platy chert ' 1,5 



Gypsum 1.5 



Limestone, white, earthy to sandy; white 

 on a fresh surface, yellow to white on 

 weathered surface; chert nodules abun- 

 dant in lower part 17 



Gypsum, white to pink, with a little lime- 

 stone 148 



Lime.stone thickly set with white platy 

 chert; has a peculiar brown fibrous sur- 

 face 3 



Concealed interval 4 



Thickness of Harrisburg member. . . 259 

 Limestone, gray, with many nodules of dark 

 chert that are brown or black on a weathered 

 surface 315 



Limestone, sandy; weathers white and contains 

 little chert; not very resistant to weather. . . 15 



Gypsum, with some shale and limestone 270 



Limestone, cherty, gray; exposed 1.50 



Thickness of part of Kaibab limestone 

 exposed 1, ooo 



18. Section near Black Rock Spring, Ariz., 25 miles south of 

 St. George, Utah. 



Moenkopi formation: 

 Middle red beds. 

 Virgin limestone member: Pe,.i 



Limestone, earthy, yellow 9 



Shale, red 36 



Limestone, earthy yellow 5 



Shale, red 26 



Limestone, earthy yellow, containing 

 hocrinus sp., Myalina sp., Baketrellia 



n. sp., Monolis/ sp 24 



Thickness of Virgin limestone mem- 

 ber 100 



Shale, red 113 



Moenkopi formation — Continued. Popt. 

 Shale, red, with prominent beds of bluish 



gypsum 22 



Shale, red 8 



Shale, red, with much gyjisum lo 



Gypsum, reddish ] 7 



Gypsum, impure, yellowish brown 10 



Thickness of part of .Moenkopi formation 

 measured 280 



Unconformity. 

 Kaibab limestone: 



Harrisburg gypsiferous member: 



Limestone, gray, filled with nodules of 

 wliite chert that breaks with a platy 



fracture 25 



Concealed interval, less resistant beds 10 



Limestone, granular; weathers white with 

 a very hackly surface; contains Chonetes 

 hUlanus, Sqnamularia g iiadalapensis . . . . 7 



Limestone, soft; weathers yellowish and 

 contains many nodules of light-colored 

 chert which does not break into plates. . 8 



Gypsum, in part pinkish 43 



Limestone, dark; weathers rough and has 



fetid odor when broken 4 



Concealed interval, ]3robably gypsum 8 



Limestone, gray, wth much platy chert. . . 4 



Concealed interval 1 



Thickness of Hanisburg member. . . 110 

 Limestone, gray, with much dark-colored chert 

 that shows as black or brown excrescences on 

 weathered surfaces 250 



19. Section in narrows of Virgin Piver below Bloom ington-. 



Utah. 

 Kaibab limestone: 



Harrisburg gypsiferous member: Feet. 



Limestone, hackly, very light gray to 

 almost white, with small dark-colored 

 chert nodules showing on weathered 



surfaces 7 



Limestone, wliite on both fresh and 



weathered surfaces 5 



Concealed interval 3 



Limestone, yellowish, filled with white 

 or light-gray chert wliich breaks into 



plates; a very characteristic rock 15 



Concealed interval 10 



Limestone, light blue-gray, with some 

 chert noddles that stand out upon 

 weathered surfaces; fossiliferous; 



upper part particularly "flinty " 15 



Concealed interval 12 



Limestone, porous, white, gypsiferous. . . 1} 



Shale, red 10 



Conglomerate and bi'eccia of limestone 



with red earthy gypsiferous matrix 14 



Shale, red and yellow, soft, sandy 7 



Limestone and shale, earthy, gray, gyp- 

 siferous 4 



Shale, red and yellow, soft, sandy 8 



