Large Ancient Ammonite Fossil
- Ammonites were marine animals that lived during the periods of Earth history known as the Jurassic and Cretaceous.
- They had a coiled external shell similar to that of the modern nautilus
- The ammonite's shell was divided into chambers separated by walls. The ammonite lived in only the last chamber.
- Each ammonite fossil is unique, but will be equal to the one pictured
~ Ammonite History ~
Ammonites are an unmistakable class of terminated spineless creatures inside the Phylum Mollusca. These fabulous looking marine creatures flourished in the Paleozoic and Mesozoic Eras, which compares to roughly 408 to quite a while back. The Ammonoidea are antiquated cephalopods that are firmly connected with the advanced loaded Nautilus, cuttlefish (for example the Cretaceous Actinosepia canadaensis), octopus, and squid. Their exceptional, loaded shell shapes have captivated gatherers as well as researchers who use ammonites as file fossils to date the general period of rocks in which the fossils show up. The expansion of ammonite species from the Devonian to the Cretaceous has added to an overflow of tests all over the planet and has become valuable for demonstrating the areas of old oceans inside the geologic record.
Ammonites are brilliant record fossils, and connecting the stone layer wherein a specific animal varieties or family is figured out to explicit geologic opportunity periods is in many cases conceivable. Their fossil shells for the most part appear as planispirals, albeit some helically spiraled and nonspiraled structures (known as heteromorphs) have been found.
The name "ammonite", from which the logical term is determined, was roused by the winding state of their fossilized shells, which fairly look like firmly wound rams' horns. Pliny the Elder (d. 79 AD close to Pompeii) called fossils of these creatures ammonis cornua ("horns of Ammon") in light of the fact that the Egyptian god Ammon (Amun) was ordinarily portrayed wearing rams' horns. Frequently, the name of an ammonite sort closes in - ceras, signifying "horn".