COLOSSAL Double Ammonite Fossil display piece- Juras (08/14/2009)...

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COLOSSAL Double Ammonite Fossil display piece- Jurassic

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COLOSSAL Double Ammonite Fossil display piece- Jurassic

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Sold Date: 08/14/2009
Channel: Online Auction
Source: eBay
Category: Natural History

COLOSSAL Double Ammonite Fossil display piece- Jurassic

An absolutely huge, fine and genuine Ammonite fossil. This is a massive fossilized ammonite formation from the Early Jurassic Period (190-175 Million years ago).

The magnificent specimen, one of the finest we have ever seen of this size, contains two ammonites; one extremely large example and one smaller and joined to the top. These fascinating creatures were preserved in the position in which they died and fell on the ocean floor, an incomprehensibly long time ago.

The anatomy of the ammonite is easily observed 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!

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, w they perished along with all the dinosaurs.

Diameter of ammonite: 12 1/4 inches.

Height, mounted: 14 1/2 inches.

Condition: Extremely well preserved specimen, provided with custom mount.

Provenance: Ex. British Private Collection. Reputedly found in Morocco many years ago.

This is a No Reserve Auction .

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