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Re: Idle question on Cretaceous chronostratigraphy

Andreas Johansson writes: 

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"?

Quite a few papers refer to a non-official 'Mid Cretaceous'. This is understandable, since calling something around 100 million years old 'Late Early Cretaceous' or 'Early Late Cretaceous' is fairly cumbersome.

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Dann Pigdon
GIS / Archaeologist         http://www.geocities.com/dannsdinosaurs
Melbourne, Australia        http://heretichides.soffiles.com
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