This fossil is part of an extinct orthoceras which had a long, straight conical shell. It shows the chambers of the straight shell which now have crystalline formations in them. These chambers were necessary to assist in breathing and for horizontal propulsion by emptying water through them. Air or water filled chambers created different buoyancies and vertical movement. 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: 87mm High, 24mm Wide
Age: Silurian 380-420 million years old
Location: Er-Rachidia, Morocco