The original source of these fossils was the Thethys sea (the Mediterranean sea), which covered a large part
of the Mediterranean countries and the Lebanese territory 100 million years ago. The presence of these numerous
animals, well kept (without post-mortem displacement)
at the same level, indicates a sudden and simultaneous death than can be attributed to a phenomenon currently
witnessed on some coasts known as "waterbloom". (A massive sudden growth of algae/planton) Not only does this algae/plankton
use all the oxygen in the seawater, but it also releases substances that poison sea animals and cause their sudden death.
Fish and crustaceans thus brutally die and sink
to the bottom of the sea in large numbers. The fossilization conditions of that period were excellent: an
oxygen-deprived sea bottom (this is why we do not find fossil mollusk) and a fast deposit of sediments on the
bodies which do not have the time to decompose and are thus generally kept intact.
**Great Fish Specimens from the Age of the Dinosaurs**
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