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Eden K-T survival

Hi Pikaia and all,

I wondered how to explain extinction of all non-avian dinosaurs during the
K-T and survival of ca.20 groups of modern birds and several of mammals.

Suppose, that very small pockets of habitat could survive the K-T
catastrophe much better than Earth on average. They could be protected by
unusual surroundings and their ecosystems already adapted to difficult
conditions. Such places could be refuges or "edens" for relatively diverse
and vulnerable small animals (amphibians, turtles, birds, mammals etc.)
when all large animals would be extinct. One example of such a refuge
could be small mountain valley in area of generally high volcanic

Jerzy Dyczkowski