Orthoceras Halves

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Orthoceras Halves

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Orthoceras Halves


This fossil is part of a long, straight conical shell.  The preserved shell is all that remains of this ancestor of our modern day squid.  It shows the chambers of the straight shell of this creature which now have crystalline formations in them.  When the chambers became too small, the animal moved forward to a new chamber. The fossil shows the chambers getting larger as the animal grew.  Some of the surrounding limestone has leached into the cavities left by the softer parts of the animal.   A lot of preparation has been taken to present this fossil.  The two halves are sold as a set. 

Note:  This is a far rarer way of seeing this otherwise common fossil, and a more accurate preparation.  Usually this fossil is polished away from the host - which only shows a one dimensional aspect.  This specimen presents the full 3 dimensional fossil, separated from its host matrix, and then cut in half to show its chambered structure.

Dimensions:   139mm High,   27mm Wide
Genus: Orthoceras
Age: Silurian 380-420 million years old
Location: Er-Rachidia, Morocco