20
If we choose another icehouse world, we can make a similar calculation. 280 million years ago the Earth was nearing the end of great Permo-‐Carboniferous Icehouse
world. If we look back at Figure 6, we can see that tillites, dropstones, and a few glendonite deposits are
Figure 11. Fossils and Geochemical Evidence for a Reduced Pole-‐to-‐Equator Temperature Gradient in the Cretaceous (Goswami, 2011). Gray curve is modern temperature profile.