anteglacial

From ante- +‎ glacial.

anteglacial (not comparable)

1. Occurring before a glacial period.
   • 1980, Gene Wolfe, chapter XIII, in The Shadow of the Torturer (The Book of the New Sun; 1), New York: Simon & Schuster, →ISBN, page 127:

     I followed it for a time—to the delta and the swamps, and at last to the flashing sea where that great beast Abaia, carried from the farther shores of the universe in anteglacial days, wallows until the moment comes for him and his kind to devour the continents.