72 



SH()RTER CONlTJBrTinNS TO GENER.\L GEOLOGY, 1921. 



Kaibab limestone — ('ontinued. Feet. 



Shale, soft sandstone, and gj-psnm, iIjc whole 



forming a gray slope 200 



Ijimestone, gray, massive, with mvich browB 



chert; light colored on fresh surface; contains 



softer shaly layers near middle of unit 230 



Limestone, sandy, cream-colored, cross-bedded, 



platy. Some limonitic staining shows 25 



Limestone, thin bedded, dark drab, with oily 



odor; contains some soft sandy layers and 



some white chert in nodules 10 



Gypsum, white, piu-e 20 



Gypsum, gray ; has some odor of oil 10 



Gypsum, white, massive, with some thin gray 



sandstone layers 15 



Thickness of Kaibub limestone. 



930 



Coconino sandstone (?): 



Sandstone, creamy yellow 



Sandstone, white 



Supai formation (?): 



Sandstone, medium grained, cross-liedded, rip- 

 ple marked, yellow-brown to light gray, ex- 

 posed 



20 

 45 



200 d= 



9. Sirtion near suJphw spring at mouth of Virgin Canyon, 

 half a miU south of La VerMn, Utah. 



Moenkopi formation: 



Rock Canyon conglomeratic member: F.-et. 



Limestone, dark colored, platy, with an 

 abundance of Bahavellia n. sp. (small 



form ) 1 



Concealed interval covered with loose 



fragments of various sorts of limestone. . . 35 



Thickness of part of Moenkopi for- 

 mation measiued 



Unconformity. 



Kaibab limestone: 



1 Iarrisl>urg gypsiferous meml )er : 



Limestone, variable; some of it u-ith much 

 light-colored ])laty chert, dark gray and 

 hackly on weathered surfaces, yellow and 

 light gray on fresh surfaces; some layers 

 sandy and others much like the lower 

 parts of the Kaibab formation with dark 

 chert nodules. Some layers fossiliferous, 

 containing Chonetcs hillanus, Squomulariu 



(jtiadalupi'iisis, Composiia sp 



Limestone, sandy limestone, calcareous 

 sandstone, white, yellow, and gray fiiable 

 sandstone, and some gypsum 



75 



Tliickn<'Ks of Harrislmrg member... 150 

 Limestone, gi'ay. cherty, resistant. m;issive; has 

 a (^ap layer filled with light-colored platy 



chert... ' 2WI 



Limestone, gray, cherty, less resistant than unit 

 above and broken into a series of terraces. 



Some lireccia and some gypsum present 50 



Gypsvmi, white 50 



Limestone, gray, cherty, vei-y resistant, mas- 

 sive; exposed 200 



Thicknessof Kaibab limeston<' exposed. . TCii; 



10. Section hi Virgin Rirrr ciinyon :1 miles jirst of Virgin 



City, Utah. 

 Moenkopi formation: 



Red beds and gypsiun. Feet. 



Sandstone, grayish brown, hard, \er\ platy. . . . 



Shale and sandy shale, yellow 



Sandstone, brown, hard, plat)' 



Shale, sandy, soft yellow 



Rock Canyon conglomeratic member: 



Limestone, dark gray, hackly; reddish lo- 

 cally and rough from weathering out of 



sandy fragments 



Limestone, pink and gray, sim-cracked; 

 weathered surface shows flecks of white 

 calcite. (!)n strike this unit becomes a 



breciiain lower part 



Ijimestone, mas.sive. yellow, with fossils 

 showing on weathered siu'face. Beds 1 

 to 2 feet thick. This unit and unit below 

 thin out on strike and lireccias above and 



below unite 



(.'oncealed intei-val chiefly, but with some 



gray limestone 



Breccia of chert and limestone in a lime- 

 stone matrix; many fragments large (0 

 inches or more across), many angidar. 



V'arialile unlK 



Interval largely concealed but with some 

 sandy yellow limestone and shale and 



some gray limestone showing 



Limestone, massive, bluish, with light-colored 



chert 



Concealed interval of soft beds forming slope. . . 



28 



10 



18 



10 



18 



45 

 ,35 



Thickness of part of Moenkopi formation 



observed 172 



LTnconformity. 

 Kaibab limestone: 



Harrisburg gypsiferous mem l)er absent? 



Limestone, bluish, with much black and dark- 

 ,gray chert, 



A short distance from the point of measurement of this 

 section 3 feet of soft sandstone rests upon the cliff-forming 

 limestone, and above this is a massive breccia, who.se ma- 

 trix is locally brick-red and which makes up almost all of 

 the Rock Canyon conglomeratic member. 



H. Section in Virgin Canyon '2h iniles irest of Virgin City, 

 Utah, beloip the month nfOil Seep Wash. 



Moenkopi formation: 



Rock Canyon conglomeratic memlier: Feet. 



Limestone, brown, full of large sand grains 



that weather out on surface 1 



( 'oncealed interval 5 



Limestone, gray; weathers hackly 3 



( 'oncealed inter\al 8 



Limestone, sandy, gray; weathers hackly. . . 4 



ConceaU'd interval 17 



Shale, yellow, sandy 4 



( 'oncealed interval 12 



Limestone conglomerate, gray, fine grained; 



weathers hackly 15 



Limestone, gray, vrith reddish patches 10 



Limestone, red, interbedded with red shale 



and a re<ldiph mottled limestone CO 



