Ammonit
The discovery of fossilized ammonites revolutionized geology. As known fossils, ammonites can be used to date the geological age of the rock layer in which they are found; therefore, they are necessary for the work of stratigraphers.
Ammonites most often become original interior decorations: they are used to decorate countertops, clocks, fireplaces, or are used as an independent design element. Ammonites are also collectibles. Ammonites are also used to make jewelry.