BULL. GEOL. SOC. AM. 



VOL. 19, 1907, PL. 12 



Figure 1. — Lithophy.s.ic ix Rhyolite, Thom.vs Uaxge, Utah 

 Natural size 



Figure 2. — Fragment of Rhyolite showing cayerxous Strcctlre, Thomas Raxge^ 



Utah 



Structure produced by exposure to desert winds. 1/2 natural size 

 STRUCTURE OF UTAH RHYOLITE 



