44 Bulletin 4 158 



instead of living on a sea bottom of black muddy ooze, it flourished 

 in a clear coralline sea. 



The absence of Enclimatoceras in the Chattahoochee section 

 does not mean the absence there of any one particular bed; we 

 have already shown how great is the vertical range of this genus. 

 Much less does its absence mean that all the beds that do not 

 contain it are the out-growth of the so-called ' ' Turritella rock' ' 

 of central Alabama. 



■X- -Jf 



