Ammonites have been known to mankind for thousands of years. They are the source of many stories and myths. The name of this spiral-shelled cephalopod originates from the Egyptian god Ammon. Ammon was pictured as a male with the horns of a ram extending from his head. The curled ammonite shells looked like the horns and were called Ammon's Stones or ammonites. Ammonites have actually been known to mankind for thousands of years. The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites.
Lots of cultures throughout history have actually associated special powers to this fossil.
In ancient Greece, it was said that if you put an ammonite under your pillow it would treat insomnia and bring good dreams.
If you put a golden ammonite (pryritized) under your pillow you would have prophetic dreams, the Romans thought that.
A Brief History of Ammonites
Ammonites first appeared in the Devonian Period. Ammonites of later durations developed septa that had actually complex folds called lobes and saddles. Ammonites such as Speetoniceras are very attractive often on auction.
Because all living cephalopods (octopus, nautilus, and squid) are predators, we can assume that ammonites were. The only living cephalopod with an external shell is the chambered nautilus. The siphuncle is a tube that links all the chambers in the shell with the living animal.
Ammonites have a large variety of size. Early ammonites, till the middle Jurassic, were smaller sized, usually less than 9 inches or 23 centimeters.
The difficult shell of the ammonite was easily fossilized. This, combined with the large abundance of this group of cephalopods and its evolutionary duration through several geologic durations, make it a great index fossil. If you find an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from need to be Triassic.
It needs to have wide distribution.
There must be a great deal of them.
It should come from a group that develops rapidly.
They should be simple to recognize.
Ammonites satisfy all the above requirements easily.
Extinction of The Ammonites
Completion of the Cretaceous Period was also the end of the ammonites. This had to do with 65 million years back. Dinosaurs and many other types of plants and animals died out at about this very same time. It is thought that a huge meteor hitting earth caused these mass terminations.
The curled ammonite shells looked like the horns and were called Ammon's Stones or ammonites.
Ammonites of later periods established septa that had detailed folds called lobes and saddles. The tough shell of the ammonite was easily fossilized. If you find an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from should be Triassic. The end additional info of the Cretaceous Period was likewise the end of the ammonites.