Huge Prehistoric Jurassic Period Fossilized Ammonite Fossil
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Huge Prehistoric Jurassic Period Fossilized Ammonite Fossil:
A very large,fine andgenuine Ammonite fossil. This is animpressive fossilized ammonite from the Early Jurassic Period (190-175 Million years ago).
The anatomy of the ammonite is easily observed here. The long extinct creature lived in the phragmocone (inside of the shell), which was divided into camerae (chambers) by septae (the prominent lines that run across the coiled shell). The ammonite only lived in the foremost and largest of these chambers, and would form a new chamber when the creature had become too large for the current one. This process of new chamber formation results in the characteristic striated appearance of the ammonite shell. The exquisitely evolved ammonite maintained communication with these old chambers, and used them as an ingenious "buoyancy device", forcing water in and out using the phenomenon of osmosis!
Close inspection reveals a multitude of smallerprehistoic marine animals, preserved in the surrounding matrix.
The ammonite was not a bottom dweller, but instead swam at mid-level in the early seas of our planet, an incomprehensibly long time ago. It would have fed on fish and other small creatures, and was itself fed on by dinosaurs. As it spent it's time in mid-water, the ammonite had to be perfectly symmetrical in the vertical plane, to avoid falling over to one side - morphologists refer to this shape as planispiral.
Although ammonites survived numerous extinction phases, they were unable to survive the cataclysmic K-T extinction event, where they perished along with all the dinosaurs.
Max. diameter of ammonite:12inches.
Condition: Well preserved specimen.
Ex. British Private Collection. Reputedly found in Morocco many years ago.Authenticity
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