STRATIGRAPHIC SECTIONS IN UTAH AND ARIZONA. 



77 



Coconino and Supai formations: Sandstone, very Feet, 

 massive but not hard, medium grained, 

 predominantly pale yellow but locally 

 pinkish. Through much of it there are 

 Bpecks of iron oxide that stand out over 

 the weathered surface in brown pimples. 

 The upper part of the sandstone is a lighter 

 yellow and has very little pink coloring; 

 the lower part is darker, has more pink 

 coloring, and is thinner bedded 1,420 



Redwell limestone: Limestone, gray, earthy, 

 porous: reddish or brownish on weathering. 

 Only fossils collected are Chaetetes mille.por- 

 aceiis, at about 1,000 feet beneath top of 

 formation, and Marginifera aff. M. splendens, 

 at 650 to 700 feet beneath top of formation . 1 . 500+ 



31. SeHion on north side of Dvimond Valhii, 15 mileft ■north 

 of St. Omrfje, I'tah. 



Tertiary or Quaternary: Basalt flow. Feet. 



Tertiary (?) sandstone: Sandstone in massive 

 beds, mediiun grained, yellow with some 

 red staining, separated by soft sandstone, 

 much of it red, and red shale. As a mass 

 viewed from a distance this series is pink 

 and contrasts with the yellow sandstone 

 below. No fossils seen. Thickness of 

 part visible (estimated) 1, 500 



[The exposure of the pinkish sandstone unit de- 

 scribed abo\'e lies 3 miles south of the ex- 

 posures described below, but viewed from a 

 distance and consideringdsolated exposures be- 

 tween it seems to succeed the lower beds vaih 

 very little interval or overlapping.] 



Cretaceous (?) sandstone: 



Sandstone, heavy bedded, medium grained, 



buff ." ;wo± 



Sandstone, red and purplish, with some shaly 

 layers 55 



Sandstone, buff and white, heavy bedded. . . 115 



Sandstone, l>uff tA white, medium grained; in 

 heavy beds with soft sandstone and shale 

 between. Lowest bed has dark limonitic 

 joint surfaces 290 



Shale, gray, clayey, and gray carbonaceous 

 sandstone that contains plant fragments. . . 30 



Quartzite, dense, reddish and gray, fine 

 grained 3 



Sandstone, light gray to brown, dense, with 

 intercalated gray and pitfple shale. Some 

 of the sandstone has carbonaceous matter, 

 and much of it is soft, though hard layers 

 stand out here and there 90 



Thickness of Cretaceous (?) sandstone. 883± 



Cretaceous (?) shale: 



Shale, steel-gray "gumbo " -iO 



Shale, brick-red, with some thin layers of 



white limestone 55 



32333°— 22 G 



Cretaceous (?) shale — Continued. Feet. 

 Shale, greenish gray, sandy and platy sand- 

 stone 45 



Thickness of Cretaceous (?) shale 140 



Jurassic limestone and shale: 



Limestone, platy, brownish gray, crystalline; 

 oolitic in part; Pentacrinus and Ostren scat- 

 tered over surface 2 



Shale and platy limestone, light gray with 

 greenish cast; some of it oolitic, some sandy. 

 The limestone is dense and hard. Trigonia 



and other pelecypods present sparingly 145 



Limestone, browni.sh, dense, platy 5 



Limestone, laminated, dense, light gray; fos- 

 sils very scarce 20 



Limestone, soft, earthy, cream-colored; might 



perhaps be called a calcareous shale 35 



Limestone, dense, cream-colored; breaks 

 with conchoidal fractiu'e and is very fine 



grained 15 



Limestone, soft, earthy, cream-colored 10 



Limestone, dense, hard, cream-colored; with 



conchoidal fi-actiu-e 10 



Limestone, hard and soft, alternating in thin 



beds • 15 



Gypsum, with some blmsh-gray shale. ....... 20 



Shale, cream-colored, calcareous 15 



Limestone, dense, hard, cream-colored; a few 



poorly preserved pelecypods observed 5 



Shale, greenish gray 15 



Shale, brick-red 5 



Gypsum 10 



Shale, brick-red; exposed 50 



Interval, mostly concealed, probably red 

 shale and sandstone 100± 



Thickness of Jiuassic limestone and 



shale 477 ± 



Jurassic sandstone: Sandstone, white, coarse 

 grained, with marked eolian cross-bedding. 

 Thickness not determined. 



38. Section throiiyh basiil beds of Aloenl'opi formation at 

 head of Virgin Narroirs, 3 miles southwest oj Bloom- 

 ington, Utah. 



Moenkopi formation: Feet. 



Rock Canyon conglomeratic member: 



Conglomerate of pebbles and angular 

 fragments of limestone and chert as 



much as 1 inch in diameter 2 



Concealed interval 8 



Conglomeratic sandstone, gra^nsh hrown. 3 



Conglomerate of chert pebi)les with some 



limestone pebbles; limestone cement. 



Pebbles as much as 5 inches in 



diameter. Individual beds 5 feet 



thick 60 



Kaibab limestone: 



Harrisbiu"g gypsiferous member absent. 

 Limestone, hard, cherty, gray. 



