388 



ZONES OF THE LOWER JURASSIC Continued. 



* The existence of several other hemerae in the Deiran and Mercian is indicated by Mr. 

 Buckman, but they are not definitely established, and are therefore omitted. See Quart. 

 Jaunt. Geol. Soc., vol. Ixxiii., pp. 257-327 (1918). 



