U. S. GEOLOGICAL SURVEY BULLETIN 845 PLATE 16 
A. FINBACK LIZARDS OF PERMIAN TIME 
Bij Sob bones of. Dimetrodon incisivus and Naosaurus found in the “Red Bec ill : 
of Tex They range in length from 3 to 10 feet and are among ais earliest forms of sauriar 
life. 
B. CARLSBAD CAVERNS, 20 MILES SOUTH OF CARLSBAD, N. MEX. 
Deposits of calcium carbonate. (National Park Service.) 
