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



Ammonites have actually been understood to humanity for countless years. They are the source of lots of stories and misconceptions. The name of this spiral-shelled cephalopod originates from the Egyptian god Ammon. Ammon was pictured as a man with the horns of a ram protruding from his head. The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites. Ammonites have been known to mankind for thousands of years. The curled ammonite shells resembled the horns and were called Ammon's Stones or ammonites.

Ammonite Myths
Numerous 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 cure insomnia and bring great 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 initially appeared in the Devonian Period. Early curled types had easy septa with a single arc like the members of the class orthocerida. Ammonites of later durations established septa that had actually complex folds called saddles and lobes. They likewise developed delicate lacey patterns on the outer shell. These patterns along with the shape of the shell and the structure of the septa are how this cephalopod is classified. Ammonites such as from Russia are very beautiful often on sale.

Since all living cephalopods (octopus, squid, and nautilus) are predators, we can assume that ammonites were. The only living cephalopod with an external shell is the chambered nautilus. It can swim and manage its depth. It does this using the siphuncle. The siphuncle is a tube that connects all the chambers in the shell with the living animal. The nautilus can subtract or add gas in these chambers to manage buoyancy.

Ammonite Size
Ammonites have a wide range of size. Specimens have actually been discovered varying from less than a centimeter to 2 meters in diameter. Early ammonites, until the middle Jurassic, were smaller, generally less than 9 inches or 23 centimeters. Throughout the upper Jurassic and lower Cretaceous larger ranges can be discovered. Titanites discovered in the south of England can be over 50 centimeters, 2 feet in size.

Biostratigraphy
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 an excellent index fossil. If you find an ammonite from a genus known to be from the Triassic Period, then the rock layer it came from need to be Triassic.

It should have broad distribution.

There need to be a lot of them.

It must come from a group that develops rapidly.

They should be simple to acknowledge.

Ammonites please all of the above requirements easily.

Termination of The Ammonites
Completion of the Cretaceous Period was also completion of the ammonites. This had to do with 65 million years back. Dinosaurs and many other types of plants and More Help 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 resembled the horns and were called Ammon's Stones or ammonites.

Ammonites of later periods established septa that had detailed folds called saddles and lobes. The hard shell of the ammonite was quickly fossilized. If you find an ammonite from a genus known 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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