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Ancient Coral Reefs
http://www.nature.ca/notebooks/english/coral.htm
Natural History Notebook (Canada) fossil coral section.
Rugose and Tabulate Corals
http://www.newcastle.edu.au/discipline/geology/research/corals/corals.htm
Images of fossilized specimens. Geology Department, University of Newcastle, Australia.
Virtual Silurian Reef
http://www.mpm.edu/reef/field.html
Silurian reefs in the field.