"You asked Q1.Why are all the glacial evidences confined to the very end of the Tertiary? Again you'll have to educate me but I understand that the classic ice ages occurred in this period from a mainstream POV. We accept superposition etc so we agree with you (if that was correct) that this period is characterised by ice-ages. For us we (non-dogmatically) align it with a nuclear winter caused by flood volcanism. For us all of that Permian Siberian volcansim etc occurred in the flood year so we expect a strong nuclear winter followed by an equally catastrophic return to equilibrium via glacial melting. You don't get that catastrophic melting in your model becasue you appeal to more graudla causes. We have a sudden cooling and an understandably sudden warming."
--As it accounts for the majority of the meteorite impacts such dusts would also contribute to this nuclear winter effect. Both volcanic and impact materials in the atmosphere may also help in reducing the effects of the abundant water vapors in the atmosphere from evaporation. Water vapor is a greenhouse gas and would if these ashes/dusts were not present turn the earth into a global pressure cooker.
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