The Ammonites for Fossil Collection - (Reference|Index} Fossils



Ammonites have actually been understood to mankind for countless years. They are the source of numerous stories and misconceptions. The name of this spiral-shelled cephalopod originates from the Egyptian god Ammon. Ammon was imagined 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 been understood to mankind for thousands of years. The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites.

Ammonite Myths
Lots of cultures throughout history have attributed 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 great dreams.

If you put a golden ammonite (pryritized) under your pillow you would have prophetic dreams, the Romans believed that.

A Brief History of Ammonites
Ammonites initially appeared in the Devonian Period. Early curled species had easy septa with a single arc like the members of the class orthocerida. Ammonites of later durations developed septa that had detailed folds called lobes and saddles. They likewise established delicate lacey patterns on the outer shell. These patterns together with the shape of the shell and the structure of the septa are how this cephalopod is categorized. Ammonites such as Speetoniceras are very attractive often on sale.

Considering that all living cephalopods (octopus, squid, and nautilus) are predators, we can presume 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.

Ammonite Size
Ammonites have a large variety of size. Early ammonites, until the middle Jurassic, were smaller sized, generally less than 9 inches or 23 centimeters.

Biostratigraphy
The tough shell of the ammonite was easily fossilized. This, integrated with the sheer abundance of this group of cephalopods and its evolutionary period through several geologic periods, make it an excellent 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 must have broad distribution.

There should be a great deal of them.

It must come from a group that progresses rapidly.

They should be simple to recognize.

Ammonites please all the above criteria quickly.

Termination of The Ammonites
The end of the Cretaceous Period was also the end of the ammonites. Dinosaurs and numerous other types of animals and plants died out at about this same time.

The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites.

Ammonites of later durations developed septa that had actually intricate folds called lobes and saddles. The difficult shell of the ammonite was quickly fossilized. If published here you discover an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from need to be Triassic. The end of the Cretaceous Period was also the end of the ammonites.

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