STKATIGRAPHIC SECTIONS IN UTAH AND ARIZONA. 

 Geologic formations of southwestern Utahm ' • • stern Arizona — Continued. 



55 



System. Series. 



rriaesic. 



F'ormation. 



Upper Trias- 

 sic. 



Chinle for- 

 mation. 



Member. 



Upper Trias- 



£ic(?). 



Shinar 11 m p 

 conglomer- 

 ate. 



Lower Trias- 

 sic. 



Moenkopi 

 formation. 



Shnabk a i b 

 shale mem- 

 ber. 



Character of rocks. 



Brick-red to deep-red shale and sand- 

 stone. 



Thickness 

 (feet). 



200 



Massive medinm-grained mauve sand- 

 stone, cross-bedded and ripple-marked. 



Brick-red sandstone and shale. 



Variable coarse arkosic cross-bedded 

 sandstone, banded with gray, white, 

 and mauve and containing fossil wood. 

 Locally known as the "Silver Reef 

 sandstone." 



Variegated ''gumbo" clay shale, bluish 

 gray, greenish gray, mauve, red, and 

 rarely brown; contains fossil wood. 



At top 20 feet of gray platy sandstone, 

 underlain by 20 feet of gray and green 

 shale with some fossil wood; at base 75 

 feet of brown sandstone, with lines and 

 lensesof pebbles of chert, quartz, silici- 

 hed wood, and rarely igneous rock; 

 fossil logs abundant. 



Brick-red to deep-red and brown shale 

 and sandstone; upper part very dark; 

 locally contains massive beds of yellow 

 medium-grained sandstone. 



Virgin lime- 

 stone mem- 

 ber. 



Rock Can- 

 yon c o n - 

 glomeratic 

 member. 



Gray to white sandy shale and soft sand- 

 stone, with some pink layers and much 

 gypsiun. 



Red beds similar to those imderlying 

 Virgin limestone member. 



the 



Three layers of earthy yellow limestone 

 separated by yellow and red calcareous 

 shale. 



Red to lu-own shale and sandstone, with 

 soft tan sandstone near base and layers, 

 streaks, and veinlets of gypsiun tlirbugh- 

 out. 



Variable assemblage of shale, limestone, 

 gypsum, conglomerate, and a minor 

 amount of sandstone. 



90 



420 



2.5 



260 



115 



475 ± 



360-630 



435 ± 



11-160 



360 ± 



0-2S8 



