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



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

Ammonite Myths
Lots of cultures throughout history have actually 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.

The Romans thought that if you put a golden ammonite (pryritized) under your pillow you would have prophetic dreams.

A Brief History of Ammonites
Ammonites first appeared in the Devonian Period. Ammonites of later periods developed septa that had intricate folds called lobes and saddles. Ammonites such as Russian Speetoniceras are great addition to a fossil collection often on auction.

Considering that all living cephalopods (nautilus, octopus, and squid) 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 connects all the chambers in the shell with the living animal.

Ammonite Size
Ammonites have a wide range look at this site of size. Specimens have actually been found varying from less than a centimeter to 2 meters in diameter. Early ammonites, till the middle Jurassic, were smaller, generally less than 9 inches or 23 centimeters. During the upper Jurassic and lower Cretaceous bigger varieties can be discovered. Titanites found in the south of England can be over 50 centimeters, 2 feet in size.

Biostratigraphy
The hard shell of the ammonite was easily fossilized. This, integrated with the large abundance of this group of cephalopods and its evolutionary duration through numerous geologic periods, make it a great index fossil. If 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.

It must have broad circulation.

There need to be a lot of them.

It must belong to a group that develops quickly.

They need to be simple to acknowledge.

Ammonites satisfy all of the above criteria easily.

Extinction of The Ammonites
The end of the Cretaceous Period was likewise the end of the ammonites. Dinosaurs and many other species of plants and official site animals 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 periods developed septa that had intricate folds called lobes and saddles. The hard shell of the ammonite was easily fossilized. If 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 likewise the end of the ammonites.

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