STRATIGRAPHIC SECTIONS IN UTAH AND ARIZONA. 



71 



Moenkopi formation — Continued. Feet. 



Rock Canyon conglomeratic member — Contd. 



Limestone, coarse, very fossiliferous, filled 

 with large nodules of blue chert 1 inch to 

 1 foot in greatest dimension. The lime- 

 stone weathers away, lea\'ing the chert 

 nodules with many fossils 15 



Limestone, light gray, with crinoid fragments 

 and some chert nodules. Surface usually 

 dark from mosses and lichens. More resist- 

 ant than units above and below 2 



Limestone, white, knobby, chalky on fresh 

 surface 2 



(conglomerate of large blue limestone colibles 

 in a white granular matrix 2 



lyimestone, coarse, granular, base somewhat 

 irregular; breaks into wedgy fragments 10 



Sandstone, soft, limestone, and limestone 

 breccia, cherty in part and copper-stained 

 locally 25 



Limestone, light yellow, filled with white 

 platy chert; beds rather thin 8 



Sandstone, yellowish gray, medium grained, 

 in beds 1 foot thick, passing along strike 

 into sandy limestone; resistant unit 6 



Thickness of Moenkopi formation ex- 

 posed 185 



Unconformity. 

 Kaibab limestone: 



Harrisburg gypsiferous member absent or in- 

 cluded in massive unit described below 

 Limestone, gray, nodular, cherty; upper part 

 thin-bedded, but unit massive as a whole 400 



7. Section onnorth side of Rock Canyon at mouth, 15 miles 

 south of Hurricane, Utah. 



Moenkopi formation: 



Rock Canyon conglomeratic member: Feet- 



Limestone, black, thin bedded, fossiliferous . 25 



Limestone, dense, gray 70 



Gypsum and red shale 100 



Thickness of part of Moenkoj)! forma- 

 tion ])resent 195 



Unconformity. 

 Kaibab liniestone: 



Han'isbiU'gg\']isiferous member absent or included 



in massive imit described below. 

 Limestone, massive, gray, with much brown to 

 black chert; contains Balostomella sp., Phyllo- 

 poraf sp., Fenestella sp., Septopora n. sp., Or- 

 thotetes sp., Derbya sp., Chonetes hi/lanus?, 

 Productus 'ivesi, Productus popei, Pustula sub- 

 horridn, Pustula subhorrida var., Pustula aff. P. 

 irghwe, Pugruix. osagensis var., Spirifer sp., 

 Squamularia guadalupensis, Coinposita suhtilita, 

 Myalina aff. M. deltoidea, Aviculiperten sp., 



Acanlhopecten coloradoensis 100 



Gyi>sum, impiu'e 55 



Limestone, white, thin-bedded, cherty 20 



Gy]jsum, impure 1 50 



Limestone, u])per part light colored, lower part 

 gray; contains relatively little chert; not very 

 resistant; weathers rather smooth, not hackly. . 40 



Kaibab limestone — Continued. Feet. 



Limestone, gray, cherty, massive; weathers 



hackly 175 



(.ij'psum, earthy, gray, impure, with thin-bedded 



limestone and some gypsiferous sandstone 108 



Thickness of Kaibal> limestone 948 



Coconino sandstone (?): 



Sandstone, deep yellow, friable 5 



Sandstone, white, rather hard ; fornts ledge 2 



Sandstone, soft, white, and sandy shale, light 

 gray in great ]iart but with some yellow stain- 

 ing 10 



Thickness of Coconino sandstone (?i. 



17 



Suiiai formation (?): 



Sandstone, yellow, friable Hi 



Sandstone, pale yellow, rather hard; massive l)ed 



forming sharji ledge 9 



^Sandstone, soft, gray, argillaceous 5 



Sandstone, red and yellow interbedded, the 

 yellow a little more resistant than the red. . . . 55 



Sandstone, mottled yellow and red 10 



Sandstone, red, argillaceous, and red sandy shale. 30 

 Sandstone, massi\-e, yellow, friable, cross-bedded, 

 with several thin beds of red sandstone. Some 

 of the yellow sandstone is white on a fresh sur- 

 face and frialjle 35 



Sandstone, massive, red, in beds 10 feet or more 

 in thickness with thin beds (1 foot or less) of 

 sandy shale between. On strike one of these 

 beds grades into yellow sandstone: others are 



bleached yellow along cracks 40 



Sandstone and shale, red, micaceous, interbedded 



in subequal amounts 100 



Sandstone, massive, brick-red, somewhat argilla- 

 ceous, with thin beds of red shale 35 



Sandstone, white, friable 17 



Sandstone, massive, brick-red, argillaceous, with 

 thin beds of interbedded red sandy shale. On 

 strike some of these beds are yellow locally. 

 Exposed 148 



Thickness of Supai formation (?) exjwsed. 500 



8. Section on Hurricaiu fault scarp 6 miles south of Hurricane , 

 Utah. 



|See rl. IX, .4, B.] 



Basalt. 



Moenkopi formation : Feet. 



Shale, red sandy, jiresent 100 ± 



Unconformity. 

 Kaibab limestone: 



Uarrisbtu'g gypsiferous member: 



Limestone, gray, thin bedded, some of it 

 containing angular fragments of chert; 

 and shale, gray or yellow. Unit unre- 

 sistant to weather. May possibly be 



basal Moenkopi 45 



Limestone, brownish to yellow, with some 

 dark-gray layers; some layers brecciated. 115 



Thickness of Harrisburg member 1(J0 



Limestone, massive, gray, with much brown 

 fliert; fos.='ils abundant in chert 260 



