io6 WHITMAN CROSS 



14. Reddish-brown friable sandstone, broken into layers one to six feet 

 thick, with shaly partings . . . . . . . .120 



15. Alternating bands of marls and shales, with layers of friable light and 

 reddish-brown sandstone ........ 70 



16. Reddish -brown sandstone broken up into layers two to seven feet in 

 thickness with a stratum of gray sandstone at the base ... 20 



17. Arenaceous and earthy gypsiferous shales; marlites, purple, brown, 

 bluish-green, and green, forming low, rounded foothills and slopes 

 from the Vermilion cliffs to the Shinarump conglomerate . . -650 



18. Gray conglomerate and sandstone. Conglomerate formed of small, 

 agatized pebbles and holding silicified wood ..... 50 



Total of Triassic 2,845 



UNCONFORMITY 



Permian 



FEET 



19. Dark, reddish-brown, shaly sandstones, passing into a massive evenly 

 bedded sandstone twenty feet from the summit of the bed. Ripple 

 marks and mud cracks occur in the upper part. 



Erosion has removed portions of the upper shaly stratum in places, 

 leaving an irregular surface for the conglomerate above to rest on -135 



20. Red, arenaceous shales with seams of gypsum ramifying through them 



in every direction . . . . . . . ■ 105 



21. Gray, gypsiferous marls with intercalated arenaceous shales . -125 



22. Red gypsiferous marls, with a large proportion of arenaceous shales . 300 



23. Impure limestone, with small fossils— Rhynchonella, Mytilus, Bake- 

 wellia, Pleurophorus, etc. ........ 4 



24. Red gypsiferous marl . . . . . . . . • iS 



25. Impure shaly limestone with arenaceous and gypsiferous shales beneath. 

 The sandy shales thicken into layers of from two to six inches in thick- 

 ness. A stratum of red marl separates this from a somewhat similar 

 band of limestone and shales beneath. On an outlying butte, two 

 miles from the Shinarump Cliff, the entire bed is a shaly limestone. 

 This stratum varies in thickness, as it was deposited on the uneven 

 surface of the beds beneath. Numerous fossils occur both in the lime- 

 stone and arenaceous layers — Discina, Rhynchonella, Bakewellia, 

 Pleurophorus, Schizodus, Myalina, Rissoa, Goniatites, Nautilus, etc., 

 found ........... 25 



26. Red gypsiferous marl with arenaceous shales throughout . . . 108 



27. Yellowish sandstone with red gypsiferous shale beneath, resting in 

 eroded hollows of the Aubrey limestone . . . . . -37 



Total of Permian ......... 854 



Total of Section ......... 4,284 



