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re: hybodonts at K/T correction
Sorry, sent last message when I meant to abort.
On hybodonts at the K/T boundary: their range virtually but not absolutely
ends at the Maastrichtian (not as I posted Campanian) with loss of the
common genus Lissodus. But, they persisted until the Paleocene: thus,
the K/T event had effectively no influence on them. A point to consider
(a declining group unaffected by the apparent chaos).