Highlights of Poriferan Fossil History
Let's travel through time
Through the waters and waves
And as we pass as fast as lightning
Let's obseve the memories saved
For as does the course of humanity
Possess an extensive history
There is much to learn from the fossils
Submerged beneath the sea
Throughout the millions of
years of history that are associated wtih the existance
of porifera, geologic phenomena and other occurances have
affected differentiations in population and fossil record.
For example, one group of the Demospongiae was able to transfer
its habitat from lower depths to shore depths due to a change
in energy. The presence of fossils upon areas that
are now land indicates that the levels of the ocean were
different. Also, we may discover when such disasters
as meteors may have influenced the geologic history of the
earth and other species which we know existed at some point
in time but are now extinct. The porifera are keys
to a past that we can only imagine- a past that is our own,
but so foreign to us.
Porifera, originating in the Vendian/Precambrian
era, experienced several fluctuations in their population
throughout the course of time. Currently, although
they are extremely divserse, this biodiversity is not representative
of the peak of their diversity, which was achieved during
the Cretaceous period. While they are still numerous
within modern times, this is not a representation of how
large the populations previously were. Decreases in
population indicate changes in geologic period.
Due to the fact that such fossil records
are rather ancient, there are holes within its structure.
For example, there is no recorded origin of the sphinctozoans
and stromoporids. These are classifications of the
existent/non-existent class of the Sclerospongiae.
This absence has partly contributed to this class's isolation
from the taxonomy of sponges, since there is no relation
other than certain physical features. Also, the fossil
history of the demosponges is interesting. Most of
the information pertaining to the fossil record of this
class is not a representative sample. While they always
represented at least a plurality of the sponges, such a
fact may not be true. Due to their chemical composition,
certain demosponges dissolve before they fossilize.
However, such facts are not completely
accurate due to certain factors that may influence the fossil
record. In fact, all of this page is theoretical.
However, all of our theories have been substantiated and
are accepted as a common perspective. Therefore, we
would also like to remind you that this information could
be altered any day. It only goes to prove how innovative
and dedicated the scientists are that research such cryptic