Ammonites
Ammonites (Ammonidae)
Ammonites are probably the most known fossils. They existed from the late Silurian era till the end of the Cretaceous era.
Their name has its seeds in the ancient Greece and means “horns of Ammon”. That is because the typical shape reminds of the god Ammon, who was illustrated as rams’ horn.

Approximately an amount of about 35,000 species existed over the million years. Some of them reached a giant shell diameter of about 2 meters. The shell of the ammonites was separated in twelve chambers, whereat the ammonite only lived in one. The other chambers had been used for regulation of the hydrostatic uplift.

History of the ammonites is affected by different kinds of mass mortality, of which they became one of the most important index fossils.
 

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Geschliffene Ammoniten(Devonian - Cretaceous)
 

Ammoniten (Devonian - Cretaceous)
 





Perisphinctes (Jurassic)
 




Gravesia gigas(Jurassic)
 



Hildoceras (Jurassic)
 

Oppelia (Jurassic)
 






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