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



Ammonites have actually been known to mankind for countless years. They are the source of many stories and misconceptions. The name of this spiral-shelled cephalopod comes from the Egyptian god Ammon. Ammon was envisioned as a man with the horns of a ram protruding from his head. The curled ammonite shells looked like 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 associated special powers to this fossil.

In ancient Greece, it was stated that if you put an ammonite under your pillow it would treat insomnia and bring excellent 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 initially appeared in the Devonian Period. Early curled species had simple septa with a single arc like the members of the class orthocerida. Ammonites of later durations established septa that had intricate folds called saddles and lobes. They likewise established delicate lacey patterns on the outer shell. These patterns in addition to the shape of the shell and the structure of the septa are how this cephalopod is categorized. Ammonites such as Speetoniceras subinversum are highly collectible fossils often on auction.

Since all living cephalopods (nautilus, squid, and octopus) 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.

Ammonite Size
Ammonites have a wide variety of size. Specimens have actually been discovered ranging from less than a centimeter to 2 meters in diameter. Early ammonites, over at this website till the middle Jurassic, were smaller, usually less than 9 inches or you can check here 23 centimeters. Throughout the upper Jurassic and lower Cretaceous bigger varieties can be found. Titanites discovered in the south of England can be over 50 centimeters, 2 feet in size.

Biostratigraphy
The tough shell of the ammonite was quickly fossilized. This, combined with the sheer abundance of this group of cephalopods and its evolutionary duration through numerous geologic durations, make it a good index fossil. If you discover an ammonite from a genus known to be from the Triassic Period, then the rock layer it came from must be Triassic.

It must have broad circulation.

There should be a lot of them.

It needs to come from a group that develops quickly.

They should be easy to acknowledge.

Ammonites please all of the above criteria easily.

Extinction of The Ammonites
The end of the Cretaceous Period was also the end of the ammonites. Dinosaurs and many other about his types of plants and animals passed away out at about this very 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 elaborate folds called saddles and lobes. The hard shell of the ammonite was quickly fossilized. If you find an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from must be Triassic. The end of the Cretaceous Period was also the end of the ammonites.

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