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antediluvial

antediluvial, a. rare.
  (ˌæntɪdɪˈl(j)uːvɪəl)
  [f. ante- + diluvi-um deluge + -al1.]
  Applied by Buckland to geological formations older than the ‘diluvial’ (then attributed to the Noachian deluge).

1823 Buckland Reliq. Diluv. 2, I have felt myself fully justified in applying the epithet..antediluvial to the state of things immediately preceding it [this great convulsion]. 1827 Edin. Rev. XLV. 317 The ante-diluvial rocks have a more compact stony aspect.

Oxford English Dictionary

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