1914] Kew: Tertiary Echinoids of the Carrizo Creek Region 41 



Scale 



''■Jed Carrizo 



Formation 



Fig. 1. Map of the southwestern part of the Colorado Desert north of the 

 Mexican Boundary Line, showing position of the geologic formations. Areas in 

 the valleys, without formational symbol, represent Pleistocene lake beds and 

 alluvium. 



