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Idle question on Cretaceous chronostratigraphy



The Cretaceous is the longest period of the Phanerozoic, yet also the
only one divided into only two epochs (Lower and Upper Cretaceous) in
the ICS chart. Is there a rational explanation for this somewhat
surprising state of affairs, or did it just "happen"?

--
Andreas Johansson

Why can't you be a non-conformist just like everybody else?