The Coming of Life
The Cambrian Period
The name comes from a part
of England once called Cambria
in Latin and now known as Whales.
The first fossils from this period
were found in Cambria.
In excavating for fossils scientists
find several layers on earth.
The deepest layer is from
the oldest stratum of the earth.
There were many invertebrate
animals. They were
protozoa, porifera,
coelenterates, worms,
arthropods, mollusks,
and echinoderms.
The most important animal
of this period was the Trilobite who
were crustaceans belonging to the
arthropods.They were the most
plentiful and powerful animals at that
time, filling the seas and oceans
because they had no enemies. They
were omnivorous. Some grew to be
longer than 15 inches. The
only plants were algae.
In the Cambrian Period
the water was warm. When
the waters cooled from the
melting of the ice the Trilobites
diminished and finally disappeared.
Pinegreenwoods Montessori
