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Webster 1913 Edition

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Adj.

[Cf. F.

géologique

Of or pertaining to geology, or the science of the earth.

Adj.

[See Geology.] Pertaining to geology; relating to the science of the earth or terraqueous globe.

geological ‎(not comparable)

geologic
- 2012 January 1, Donald Worster, “A Drier and Hotter Future”, in American Scientist, volume 100, number 1, page 70:
  Phoenix and Lubbock are both caught in severe drought, and it is going to get much worse. We may see many such [dust] storms in the decades ahead, along with species extinctions, radical disturbance of ecosystems, and intensified social conflict over land and water. Welcome to the Anthropocene, the epoch when humans have become a major geological and climatic force.

geologic — see geologic