[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

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.


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