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Mesozoic Ammonites
Ammonites of the Mesozoic
Ammonites are a group of coiled shelled
cephalopods that lived in our oceans and seas during the
Cenozoic Era. This
was during the age of dinosaurs, at least it was on land, but
in the oceans it was another story.
In the oceans enormous marine reptiles like the
ichthyosaur, the mosasaur and plesiosaur ruled.
They along with Mesozoic sharks and other fish were the
dominant predators of these ancient seas.
So, what did they eat?
Just like today, in our modern oceans where big fish
eat little fish which in turn eat still littler fish the same
was true then. One
thing that made these seas different than those in our modern
world was the presence of ammonites.
As mentioned earlier these ammonites are coiled shelled
cephalopods but what is a cephalopod?
See additional
description at
the bottom of the page
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Cephalopods are mollusks that have
legs. The word
cephalopod actually means head –foot.
These mollusks have tentacles (legs) of varying
number radiating outward from around their mouth.
Modern examples of cephalopods include the octopus,
squids, cuttlefish and the nautilus.
As a group they are intelligent, sophisticated
predators of other creature in the ocean like small fish,
crustaceans or other cephalopods.
They range in size from the giant squid which
reaches a length of about 45 feet and the giant pacific
octopus with a maximum arm span of about 14 feet down to
those species that full grown could easily fit in the palm
of your hand.
The only living group of cephalopods that have a shell
today are the nautiloids but in prehistoric times there
existed the ammonites.
Ammonite species number in the
hundreds with more discovered all the time.
In the Mesozoic seas they were incredibly common
and are used by geologist as index fossils, which have to
be very common and wide spread for a certain age in
earth’s past.
Just like the living cephalopods ammonites came in an
incredible range of size and shell shapes.
Some had streamlined narrow shells that would seem
to allow fast movement through the water, some looked to
have shells and a body shape that seem to indicate more of
a planktonic existence and some with massive shells and
size were probably benthic bottom feeding predators.
The diversity of body size is also a reflection of
the modern cephalopods.
Some of the ammonites were small, just fingernail
size while others have been discovered with shells 6 feet
or more across.
Their shells are plentiful in Mesozoic marine rocks
but fossils showing the rest of their bodies are almost
unknown.
In my sculpture I combined what we
know from what did fossilize, (the shell), with what we
might only guess at by looking at their close living
relatives to create the “living ammonite”.
My sculpture shows two individuals, close to the
bottom, suspended in a waving bunch of sea weed.
The plants would have provided these ammonites with
a place of concealment from the large Mesozoic reptiles
which preyed upon them as well as a place from which they
could pursue their own prey.
The sea weed also has a structural as well as
artistic role to play in this sculpture.
The plant provides a very strong support to the
ammonite and holds them off the sculpture’s base while
still giving the allusion of their floating above the
bottom. This
allusion of floating is further enhanced by having one of
the ammonites cantilevered out above the other with hidden
points of attachment from many of the perspectives taken
while viewing this artwork.
The sculpture is cast bronze on a marble base.
It is approximately 24” x 8” x 12” in size and
weighs 30 lbs.
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Mesozoic Ammonites
Copyright Herrmann Studio 2010 |
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