Ancyloceras Heteromorph Ammonite 610mm New

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Ancyloceras Heteromorph Ammonite 610mm

SKU:TFS0994
£2,992.00

Availability:In stock

Details:

Superb large heteromorph ammonite in fine bronze mount, the clasps do not harm the specimen, which support the ammonite on a bronze plinth. The bronze mount very attractive to gallery or museum exhibition standard. Read the ammonite description below...

Geological age: Lower Aptian - Upper Albian 113 to 108 million years.
Genus Att: Audoulioceras, Ancyloceras cf. matheronianum (D’Orbigny 1842)
Location: Pays de Haha, Essaouira south to the Souss Valley, Western Morocco High Atlas Range.

Heteromorph measurements in bronze mount.
Height: 61.0 cm
Width: 26.0 cm
Depth: 11.0 cm

Heteromorph sp. measurements.
Height: 49.5 cm
Width: 26.0 cm
Depth: 9.0 cm

Approximate weight: 15 Kg

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Details

The strangely weird fossilised shell of this heteromorph mollusc is not often instantly recognisable as part of the sub orders of ammonoidea, the eccentrically winding growth of the shell appears quite exotic. For a long period in palaeontology up until quite recently its was thought that the evolving form was a period of decline, from the Jurassic period when this type of dimorphism first appeared for the ammonites and persisted up to their eventual extinction in the late Cretaceous period.


Now it established that in fact this was a radiation of types of heteromorphs which were developing and evolving a greater diversity rather than a declining last act of the ammonite group. This just so happened to be leading up to and at around the time of the great mass extinction at the KT boundary. The eccentric fossilised shell, termed an internal mould is from around 100 million years ago. Excavated from the High Atlas mountains of Morocco, the western province of Agadir-Ida Ou Tanane Prefecture and of the Souss-Massa, Marrakech-Safi region. The Fossil Store has surmounted the specimen fossil onto the superb bronzed mount, this balances the fossils securely, which can be lifted off the stand for transport and further study.


Early forms of Jurassic heteromorph ammonites had morphology which was not as exaggerated as this specimen, in their early development the last outer whorl of the shell became separate from the main inner spirals, this developed becoming more pronounced as in this example, eventually towards the end of the Cretaceous types were developing complex and convoluted intertwined types. A most fascinating glimpse back in time to a period of great expansion which finally and abruptly ceased.

Additional Information

SKU TFS0994
Age Cretaceous
Origin Morocco
Colour Brown

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