We don't have synonyms for palaeocene yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are paleocene, palaeogene and paleogene.
(n) :
Alternative form of Paleocene. [(geology) A geologic epoch within the Paleogene period from about 65 to 56 million years ago; marked by the rise of the first large mammals in a tropical climate.]
(adj) :
Alternative form of Paleocene. [(geology) Of or pertaining to the Paleocene epoch.]
(n) :
Alternative form of Paleocene. [(geology) A geologic epoch within the Paleogene period from about 65 to 56 million years ago; marked by the rise of the first large mammals in a tropical climate.]
(adj) :
Alternative form of Paleocene. [(geology) Of or pertaining to the Paleocene epoch.]