BULL. GEOL. SOC. AM. 



VOL. 19, 1907, PL. 28 



Figure 1. — Massive Sandstone at Base op Sundance For.mation, south or Ai.covAj Wioming 

 The distant ridge is capped by Cleverly sandstone ; red beds show in foreground 



Figure 2.— Chugwater Red Beds, Sundance For.matiox, Morrison Shale, and Cloverly Sand- 

 stone, souTii OF Lander, Wyoming 



Pool of petroleum in the foreground 



SUNDANCE AND ASSOCIATED FORMATIONS, WYOMING 



