What are ammonity?

Amonites were an important group of marine molluscs who were numerous in the Earth's oceans for 360 million years, from about 425 million years, during the Silurian period, up to 65.5 million years when they disappeared together with dinosaurs and many other Clades.

ammonites were puzzles, most closely related to living octopus, octopus and sepia, although all their closest relatives are disappeared. They lived in a distinctive spiral shell, which they could fill with gas and use to float at the required level in the water. Several amonites had non -fleet shells, including complex spin patterns. The ammonites were given their name Plina the Elder, who called them the "horns of ammon" after the Egyptian God, who was often depicted with the horns of the rams. They had large eyes used to locate the prey and the tentacles on the grab to. The reconstruction of the life regime of ammonite life is difficult because they have no livingNear relatives, but many have learned by creating models of their shells and experimenting with them in water reservoirs.

ammonite fossils are very common because their free floating regime meant that they often lived between a very oxygen seabed, so when they died and sank, there were few organisms that worsened the remains. Cement would accumulate around a shell in a structure known as concrete, which further retained it and prevented worsened. Today, these concrete can be found on the ground like round knots. Open is by choosing it can reveal fossil inside.

Some ammonite fossils have been preserved so well that the inner rainbow coating that covers the inner layer of the animal shell during life is maintained. When some of these fossils become the quality of gems, which is a mineral that was dubbed with ammolite. Ammolite is commercially mined in small quantities in Canada and usedIt is for jewelry. It is one of the few biogenic gems, along with Amber and Pearl.