E. Blackwelder — Reef of Calcareous Algce (?). 61' 



Fig. 1. 



Fig. 1. A portion of the exposed reef showing dome-shaped limestone 

 masses with mammillated surfaces. The slight dip of the strata is indicated 

 by the general slope. 



Fig. 2. 



Fig. 2. Close view of a single limestone dome, showing the cabbage- 

 shaped bodies cemented by a small amount of mortar-like material. 



