76 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOC.Y, 1!>21. 



Kaibal> limestone — Continued. 



ITarrisbursj gypsiferous memlier— Continued. 



Limestone breccia, liaekly on weathered 

 surface, pinkish locally but light blue- 

 gray in general toni'; sun-cracked on 

 weathered surfaces; a very character- 

 istic rock 



Lime shale, gray to yellow, sandy ,with a 

 little white chert in bands 



Limestone, soft, ])orous, pink, yellow, and 

 gray in color; weathers to a hackly or 

 cavernous surface 



Limestone breccia, dark blue-gray, with 

 hackly surface, more resistant than 

 unit above 



Limestone breccia, relatively soft; 

 matrix a yellow limestone. Frag- 

 ments in breccia as large as -1 inches in 

 diameter 



Thickness of ITarrisViurg member. . 



[Remainder of section measured farther down eanvati] 



Limestone, thin bedded, ash-gray, with some 

 layers of chert breccia and calcareous shale. 

 Possibly duplicates jnirt of the beds de- 

 scribed above 



Limestone, massive, unifonn, fine grained, 

 gray on fresh surface and brownish on 

 weathered surface; filled with lay,->rs and 

 nodules of brown chert; fossiliferoua 

 throughout 



Breccia of limestone and chert in a limy 

 matrix; whole mass weathers to a yellow- 

 brown color 



Gy ]isum and red shale 



Breccia of limestone and white chert in limy 

 matrix 



Shale, soft, gray, and gypsum 



Limestone, very massive, gray to light gray 

 on weathered surface, cherty, fossiliferoiw. 



Sandstone, soft, yellow, gyjisiferous 



limestone, gray to brown, very cherty, tliin 

 bedded 



Limestone, arenaceous, light gray to white, 

 cherty 



Thickness of Kaibab limestone 



Feet. 



137 



70 



27.5 



110 

 50 



20 

 10 



220 



8 



32 



25 

 957 



Coroiiiiio .sandstone (?): 



Sandstone, coarse grained, cross- Ijedded, 

 brown on weathered surface, liu'ff on fresh 

 surface b5 



Sandstone, white on fresh surface, dark gray 

 or Iilackish on weathered surface, cross- 

 Ijodded ; varialile along strike 5 



Sandstone, white to cream-colored, earthy, 

 fine grained; locally iipper part of unit 

 whiter than lower purl 25 



Thickness of Coconinii .sandstone (?)-- 45 



Supai formation (?): Sandstone, medium grained, Feet, 

 cross-bedded, very massive; lower part yellow 

 and l)rown, with a little irregular red staining; 

 middle part similar but with much red staining 

 anil a few thin soft red sandstones; upper part in 

 some places a uniform red but usually a clean 

 yellow-lirown. The unit is so uniform that it 

 can not be subdivided. No fossils observed. 1,490 



Redwall limestone: Limestone, siliceous, and 

 sandstone, mostly heavy bedded, light gray on 

 fresh surface, red-brown to dark gray on 

 weathered surface. .About 200 feet below the 

 top of the exposure a marked dark-gray layer 

 20 feet thick looks as if it might be stained by 

 hydrocarbons but shows none on, a test. Frag- 

 ments of fossils observed 500-1- 



20. Sectii>n in Beaver Dam Mountains near ArroirhemJ Trail 

 freim Salt Late City to Los Ani/iles, about JO miles 

 nnrtkirest of St. George^ Uta^. 



Moenkopi formation. 

 ITncoiiformity. 



Kailiali limestone; Feet 



Harris! lurg g\rpsiferous member (some of this 

 unit may be basal part of Moenkopi formation) : 

 Limestone, very light gray, almost white. . 4 

 Limestone, hackly, darker than overlying 



layer 4 



Limestone, dark gray, with a few fossils. . . 6 

 Concealed interval; fragments of gray lime- 

 stone on surface '■ 



Concealed interval; fragments of platy 



quartz and chert on surface 15 



Limestone, lilled with platy chert of very 



light color 17 



Limestone, pink and gray, with hackly sur- 

 face, fossiliferous 11 



Limestone, yellowish, thin bedded 10 



Limestone, gray to pinkish, with hackly 



surface, fossiliferous 8 



Concealed interval 12 



Limestone and platy white chert, in equal 

 amounts. Weathered surface has a pecu- 

 liar brown, fibrous appearance - . 16 



Concealed interval 39 



Limestone, gray, wit h hackl \- surface 5 



Concealed interval 28 



Thickness of Harrishurg member. . . 184 



Limestone, gray, cherty, massive 195 



Interval mostly concealed but with some fos- 

 siliferous limestone showing; probably much 



of it gy])sum 2t)0 



Limestone, massive, gray, cherty 170 



Limestone, yellowish to wliite, ver\- sandy; 

 some nodules of calcite ])resent. Lower 

 part es])ecially frial)le where exposed to 



Weather 40 



Concealed ''5 



Thickness of Kail>ali limestone 924 



