More on Cronian Sea from Infoplease:

• Cronian Sea - Cronian Sea The north polar sea. Pliny says, “A Thule unius diei navigatione mare concretum, ...
• John Milton - Paradise Lost: Book IX - Meanwhile the hainous and despightfull act Of SATAN done in Paradise, and how Hee in the Serpent had perverted EVE, Her Husband shee, to taste the fat
• Dictionary of Phrase and Fable: C - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "C"