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The Cretaceous Period - http://www.ucmp.berkeley.edu/mesozoic/cretaceous/cretaceous.html
An overview of the period from the UC Berkeley Museum of Paleontology.
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All Things Cretaceous - http://serc.carleton.edu/research_education/cretaceous/
Educational module for use by researchers, teachers and students, provided by Jen Aschoff, Montana State University.
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Cretaceous Sponges - http://www.cretaceous.de
Systematic description of Campanian porifera from Misburg and Höver, Germany.
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