Source : Webster's Revised Unabridged Dictionary (1913)

Geologic \Ge`o*log"ic\, Geological \Ge`o*log"ic*al\, a. [Cf. F.
   g['e]ologique.]
   Of or pertaining to geology, or the science of the earth.

Source : WordNet®

geological
     adj : of or relating to or based on geology; "geological
           formations"; "geologic forces" [syn: {geologic}]