STRATiORAPHIC SECTIONS IN UTAH AND ARIZONA. 



73 



Moenkcipi formation — Continued. Fct. 



Rock Canyon conglomeratic member — Contd. 



limestone breccia, gray 10 



Sandstone, yellow and gray, with sandy shale 



and shale 15 



Limestone conglomerate, gi'ayish brown 5 



Thickness of part of Moenkopi forma- 

 tion measured 100 



Unconformity. 

 Kaibab limestone: 



HaiTisburg gypsiferous member absent? 



Limestone, gray, cherty. 



12. Section in Virgin Canyon 2 miles west of Virgin City, 



Utah, at mov.th of Oil Seep Wash. 



Moenkopi formation: 



Rock Canyon conglomeratic memter: Fi^et. 



Limestone, gray, nodular; undeterminable 



fossils 1 



Concealed inter-v-al 5 



Limestone conglomerate, hackly and very 



rough on weathered surface IS 



Limestone, gray, sun cracked and flecked 



vpith calcite !) 



Limestone, red 2(1 



Limestone conglomerate and breccia with 



fragments as much as 2 feet in diameter; 



matrix >'ellow limestone 15+ 



13. Section in Smith's Mesa, J miles north of Virgin Cily, 



Utah. 

 Jurassic sandstone. 

 Chinle formation: Feet. 



Shale and sand.stone. brick-red; estimated (not 

 present in Smith's Mesa, but seen at a point 

 near by) 200 



Sandstone, mauve, cross-bedded, ripple 

 marked, resistant 90 



Shale and sandstone, brick-red 420 



Sandstone, coarse, arkosic, cross-bedded, gray- 

 white and mauve; suggests volcanic ash; 

 contains fossil wood. Locally known as the 

 '• Silver Reef sandstone " 25 



Shale "giunbo," variegated, bliush gray, 

 greenish, mauve, red, and some yellow- 

 lirown ; contoins fossil wood 260 



Thickness of ( 'hinle formation 995 



Shinarump conglomerate (PI. XIII, ,1): 



Sandstone, .gray, platy, with a few pebbles. ... 20 



Shale, gray to green, with some fossil wood 20 



Sandstone, coarse, gi'ay-white on fresh siul'ace, 

 limonitic brown on weathered surface; 

 locally filled with l)lack blebs of wad or some 

 similar sulistance. Contains lenses of peb- 

 bles of chert, variously colored, quartz, 

 silirified wood, and minor igneous rock. 

 Base is irregular and apparently unconform- 

 able. Unit contains abimdance of fossil logs, 

 mostly siliciiied, though in part replaced by 

 copper minerals 75 



Thickness of Shinan mip conglomerate . . . 115 



Moenkopi formation: Fcot. 



Sandstone, soft, and shale, brick-red to very 

 deep red, with gypsiun and a httle lighter- 

 colored shale; weathers to a fairly even 



slope 405 



Shnabkaib shale member: Shale, sandy, and 

 sandstone, soft, fine-gi'ained, creamy white, 

 with some pinkish layers and gypsimr; 



weathers to a fairly even slope :(G0 



Sandstone and shale, brick-red, and light 

 bluish-gray gypsum, lighter colored than the 



upper red beds 400 



Virgin limestone member: 



Limestone, yellow, earthy, fossiliferous; 

 contains Myalina n. sp., Pseudomonotis 



n. sp., Bakewellia n. sp 5 



Shale, yellow and red 25 



Limestone, yellow, earthy, fossiUferotis; 

 contains Myalina n. sp., Pseudomonotis 



n. sp 5 



Shale, yellow, calcareous 25 



Limestone, fairly massive, yellow, earthy; 

 contains Isocrinus sp., Spirorbis sp., 

 Tcrebratula' n. sp., Pinna? sp., Bake- 

 xrcUia n. sp., Pseudomonotis n. sp., 

 Myalina n. sp., Aviculipecten. 4 sp., 

 Myophoria?, sp., Pleurophorus? sp., Pleu- 

 rotomariaf, 2 sp., Naticopsis sp., ammo- 

 nite? undet 20 



Thickness of Virgin limestone 



member 80 



Sandstone and shale, brick-red, -ivith gypsum. . li'iO 

 Rock Canyon conglomeratic member: Irregular 



basal unit of limestone, conglomerate, etc 1 70 



Thickness of Moenkopi formation 1, 775 



Kaibab limestone (see sections in Virgin River 

 cany6n). 



14. Section at ihe Harrishurg dome, 8 miles east of north of 

 St. George, Utah. 



Fool. 



Shinarump conglomerate 100 + 



Moenkopi formation: 



Shale and sandstone, brick-red, upper part 

 very dark colored 320 



Sandstone, yellow, mediimi grained, massive 

 in upper part 75 



Shale, red, with some sandstone and gypsum . 80 



Shnabkaib shale member: Shale, sandy, 

 white to light gray, with gypsum and some 

 pink shale 630 



Shale, red, sandy, with gypsum 435 



Mrgin limestone member: Limestone, earthy, 

 greenish yellow, in three thin bands sepa- 

 rated by greenish-yellow and I'eddish- 

 brown shale. Lower band contains Isocri- 

 nus sp.. Pugniix n. sp., Aviculipecten sp.. 160 



Shale, red, some of it sandy, with gypsun and 

 a little bluish gypsiferous shale 275 



Shale, yellow, gypsiferous, containing locally 

 thin black limestone layers with Balenellia 

 n. sp. (small form ) 60 



Rock Canyon conglomeratic member appar- 

 ently absent. 



Thickness of Moenkopi formation 2, 035 



