346 



WILLIS T. LEE 



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140 feet. Dakota. Two massive sandstone layers separated by a soft shaly layer of 

 varying thickness ; leaf impressions near the top of the upper division. 



n feet Greenwich clay shale, soft and fine grained. 



12 feet dull red clay shale, soft and fine grained. 



10 feet brown to yellow shale. 



6 inches argillaceous limestone; numerous fine dark laminre. 



18 inches 1-uff-colored shale. 



6 inches argillaceous limestone; numerous fine dark lamina?. 



18 feet variegated joint clay. 



2 feet argillaceous limestone, fine grained and hard, with contorted laminae. 

 30 feet variegated shales ; very soft and easily eroded. 



15 feet dark shales containing irregular masses of gypsum. 



18 inches gypsum containing streaks of clay. 



8 feet variegated shale containing nodular-like masses of gypsum which vary in size from grains to 

 masses a f. ot or more in diameter. About one third of the mass is gypsum. 



25 feet gypsum in well-defined layers. Often separated by layers of clay. 



5 feet massive gypsum. 



30 to 40 feet red gypsiferous shales, soft and regularly bedded. 



60 feet red calcareous sandstone, oolitic, cross-bedded. Individual layers variable in 

 thickness and character. Near the top it becomes shaly and passes gradually into 

 the gypsiferous shales above. 



175 to 200 feet red sandstone, massive, cross-bedded. 



6 feet red arenaceous shale. 



1 foot red sandstone. 

 4 feet fine red shale. 



9 feet even -bedded red sandstone. 



2 feet red arenaceous shale. 



40 feet red sandstone, cross-bedded; the individual layers thin out laterally. 



15 feet poorly cemented red sandstone alternating with layers of shale. 

 5 feet massive red sandstone. 



30 feet soft red sandstone containing hard layers which are ripple-marked. 



4 feet hard, white, argillaceous limestone composed of numerous thin layers; greatly 



[contorted. 



15 feet red sandstone in thin flaky layers. 



(River bottom.) 

 Fig. 2. — Section 1, near the mouth of Plum Canyon. 



