BULL. GEOL. SOC. 



AM. 







VOL. 15, 1903, PL. 26 



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Figure 1.— Sundance and Associated Formations on east Side of Stockade, Beaver Valley, Wyoming 



A. Gypsum at top of Spearfish formation 



Figure 2.— Typical Exposure of Lakota Sandstone in Fall River Canyon, South Dakota 

 SUNDANCE AND ASSOCIATED FORMATIONS 



