106 



ANNALS NEW YORK ACADEMY OF SCIENCES 



Feet 



Green and purple massive shale, with some sand ; iron stains 12 



Soft thin sandstones 2 



Green sandy shale 2 



Soft sandstone, green and gray 12 



Green shale with some sand 12 



Purple shale • 4 



Calcareous nodular layer. 



Massive shale, green and purple 2 



Purple shale, with calcareous nodular layer 4 



Calcareous nodular layer 1 



Massive shale, green and purple S. 



Massive but soft sandstone; light red and broMm at bottom, but mostly 



white ; slightly brecciated near the top and containing some calcite .... 20 



Massive red shale with some sand 12 



Massive shale with calcareous nodules, purple and yellowish 5 



Soft bright red argillaceous shale 3 



16& 



Fig. 70. — Section of the Morrison forma- 

 tion on north side of Moores Canyon, 2% 

 miles northiv&st of Hulett, Wyoming. 



Scale, 125 feet to 1 inch. (Darton after 

 O'Harra.) 



Fig. 71. — Section of the Morrison forma- 

 tion 2% miles west of Bellefourche 

 River, Wyoming. 



Scale, 125 feet to 1 inch. (Darton after 

 O'Harra.) 



The following sections of the Morrison formation in the Black Hills 

 region are given by Loomis (1902, 7) : 



Section on Bellefourche River, Wyoming 



Feet 



Olive green clay 70 



Yellow-green clay with small concretions 12 



Maroon clay 10 



Green clay 6 



Limestone concretions 1 



Green clay 6 



Maroon clay with small concretions 6 



Green clay with small concretions 10 



Limestone concretions 1 



Green clay _4r 



Limestone concretions 1- 



