Pages 94-95:
If the Antarctic ice sheet is the result of catastrophic deposition of the Martian ocean via interplanetary electrical discharge, it seems highly unlikely to me that it would carry any record at all of the Martian climate. Such an energetic, chaotic process should scramble any ice core climate signal, since ice cores measure climate via comparison of isotope and gas abundances in stratigraphic layers.
Instead, it seems significant that the Antarctic temperature record pre-Younger Dryas is quite a bit smoother than the Greenland signal. This would seem consistent with scrambling.