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Solhofen lagoon

The lagoon cannot have been totally anoxic and stagnant, or  else
there would be no fossils of marine animals.  It is likely that
the surface layers were oxygenated and su pported a copious
algal flora, but the deeper parts were anoxic and stagnant, like
the depths of several water bodies, including the Black Sea.  Any
unfornate creature that dived too deeply would be in trouble, but
most fossils are almost certainly remains of creatures that died
from other causes and then sank into the depths from the
oxygenated surface layers, after death.


>From: David Brez Carlisle
bk090@Freenet Carleton.CA