Theory that the earth’s geological features are the result of long-term processes, still visible, that require immense geologic time; although there were antecedents, the term’s modern sense is attributed to Charles Lyell c. 1830. Akafluvialism.
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diluvianism (... ). Diluvianism was replaced by uniformitarianism after 1870.)
drift theory (Eighteenth century proposition advanced by the proponents of diluvianism that unconsolidated ...)