BULL. GEOL. SOC. AM. 



VOL. 17, 1905, PL, 77 



Figure 1. — Bighorn Limestone on Deadwood Shale, Owl Creek Canyon, 2 Miles West of Long. 109 c 

 Upper half of section is Madison limestone. South end Shoshone mountains in distance to right 



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Figure 2. — Whitewood Limestone in Quarry on Whitewood Cheek, 2 Miles North of Deadwood 



All below the wis Whitewood limestone, above which are green shales and then Parhasapa (car- 

 boniferous) limestone. Photograph by T. A. Jaggar, Jr. 



EXPOSURES OF BIGHORN AND WHITEWOOD LIMESTONES 



