xkcd #2902: Ice Core ( imgs.xkcd.com )
Alt text:
If you find an ash deposition layer from a year in which an eruption destroyed an island that had Camellia sinensis growing on it, you can make a Gone Island Ice_τ.
Alt text:
If you find an ash deposition layer from a year in which an eruption destroyed an island that had Camellia sinensis growing on it, you can make a Gone Island Ice_τ.