EXPLANATION OF PLATE 29 



Fig. A. Concretions in red radiolarian chert, from the Franciscan group in 

 the Santa Ynez Mountains. 



Fig. B. Concretions in red radiolarian chert, from the Franciscan Group m 

 the Santa Ynez Mountains. 



Fig. C. Concretionary red chert, from the Franciscan area in North Berkeley. 



[418 j 



