Template:Cambrian substrate revolution

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Revision as of 21:36, 30 June 2008 by imported>Philcha (correct default caption)
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Before:
After:
Sessile
organism
anchored
in mat
Animal
grazing
on mat
Firm, layered, anoxic, sulphidic substrate
Loose,
oxygenated
upper substrate
with
burrowing
animals
{{{caption}}}