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Loch Ness - problems for plesiosaurs

If indeed there is any monster in Loch Ness (and, after, people see Elvis
and take his photo every so often, even though the King is long gone...), it
cannot have been there since the Mesozoic.  Loch Ness was under a couple of
kilometers of ice during the Pleistocene, so all the life in it are animals
which entered the lake after the last deglaciation.

If indeed Nessie does turn out to be a pleisiosaur (a highly unlikely event,
but Oh God!, if only it were true!), that means there would have to be a
population of those sauropterygians living somewhere else (in particular, in
the oceans) (or else the non-Loch population would have to have gone extinct
in the last few millenia).

Thomas R. HOLTZ
Vertebrate Paleontologist, Dept. of Geology
Email:Thomas_R_HOLTZ@umail.umd.edu (th81)