BULL. GEOL. SOC. AM. 



VOL. 10, 1898, PL. 43 



Figure 1. — Lakoia Sandstone lying uxconfokmably on Unkpapa Sandstone, north side Siieps Canyon 



Black Hills 



FlGURT. 2. — L^NKI'APA SaN1iST(JNE, NEAR Hr\D cil OdiII f^\NVON, BlaCK HiI.LS 



LAKOTA SANDSTONE AND UNKPAPA SANDSTONE 



