1916] 



Packard: Cretaceous of Santa Ana Mountains 



159 



Three faunal zones have been recognized in the Cretaceous of the 

 Santa Ana Mountains. The lowermost, the Aetaeonella ovit'ormis 

 zone, yields a large fauna which is older than that from the type Chico 

 on Chico Creek, but younger than that of the uppermost Horsetown. 

 The second, or Turritella pescaderoensis zone, possibly represents a 

 part of the Chico known at Chico Creek ; while the uppermost, the 

 Tellina ooides zone, yields a fauna that is certainly included in the 

 typical Chico. 



Transmitted April 9, 1915. 



