MOOK, STUDY OF THE MORRISON FORMATION 103 



Section of Morrison Formation on Ridge south of Lytic Creek, 8 Miles southeast 

 of Devils Tower, Wyoming 



Feet 



Argillaceous limestone 2 



Concealed 3 



Argillaceous limestone 1 



Grayish soft shale 12 



Argillaceous limestone 1 



Yellowish-gray shale 6 



Argillaceous limestone 1 



Greenish shale 40 



Argillaceous limestone Yz 



Greenish shale 30 



96% 



The upper and lower contacts are not clearly shown at this place. 



Pig. 64. — Section of the Morrison forma- 

 tion on north side of Sourdough Creek, 

 6 miles north of Hulett, Wyoming. 



Scale, l25 feet to 1 inch. (Darton after 

 O'Harra.) 



Fig. 65. — Section of the 2Iorrison forma- 

 tion on ridge south of Lytic Creels, 8 

 miles southeast of Devil's Tower, Wyo- 

 ming. 



Scale, 12.J feet to 1 inch. (Darton after 

 O'Harra.) 



Section of Morrison Formation on prominent Lakota-capped Hill, 4 Miles 

 east-southeast of Devils Tower, north of Lytic Creek, Wyoming 



Feet 



Impure fire clay, containing rough nodular layer 2 



Fine green shale 12 



Sandy fire clay 1 



Fine green shale, locally with purple tinge 70 



Lime-clay shale 6 



Fine green and drab shale 12 



Green shale with some lime-clay nodules 16 



Limestone, slightly argillaceous 6 



125 



Section of Morrison Formation on north side of Deer Creek, 10 Miles northeast 



of Hulett, Wyoming 



Feet 



Dark purple shale, weathers to light purple 9 



Massive sandstone 1 



