BULL. GeOL. SOC. AM. 



VOL. 8, 1896, PL. 14 



Figure i. — View looking North from east End of southern Mesa 



Orenda butte and its cones on left ; Black Rock butte on extreme right ; immediate foreground is southern 



lava sheet, and the interval is Laramie sandstone 



Figure 2.— View of largest Cone on southern Mesa, looking West 

 The cone is about 300 feet high and was about 2 miles from the camera 



Figure 3. —Escarpment at east End of Eeucite Hills 

 Showing lava sheet and talus. I,ava sheet from 50 to 75 feet thick 



LEUCITE HILLS OF WYOMING 



