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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Geology  \Ge*ol"o*gy\,  n.;  pl  {Geologies}.  [Gr.  ge`a,  gh^,  the 
  earth  +  -logy:  cf  F.  g['e]ologie.] 
  1.  The  science  which  treats: 
  a  Of  the  structure  and  mineral  constitution  of  the 
  globe;  structural  geology. 
  b  Of  its  history  as  regards  rocks,  minerals,  rivers, 
  valleys,  mountains,  climates,  life,  etc.;  historical 
  c  Of  the  causes  and  methods  by  which  its  structure, 
  features,  changes,  and  conditions  have  been  produced; 
  dynamical  geology.  See  Chart  of  {The  Geological 
  2.  A  treatise  on  the  science.