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



Ammonites have been known to humanity for thousands of 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 resembled 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.

Ammonite Myths
Lots of cultures throughout history have actually attributed unique powers to this fossil.

In ancient Greece, it was said that if you put an ammonite under your pillow it would cure sleeping disorders and bring excellent dreams.

The Romans believed 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. Ammonites of later durations established septa that had intricate folds called lobes and saddles. Ammonites such as from Russia are very attractive often on auction.

Because all living cephalopods (squid, octopus, 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 control its depth. It does this using the siphuncle. The siphuncle is a tube that links all the chambers in the shell with the living animal. The nautilus can add or deduct gas in these chambers to control buoyancy.

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

Biostratigraphy
The tough shell of the ammonite was quickly fossilized. This, combined with the sheer abundance of this group of cephalopods and its evolutionary period through a number of geologic durations, make it a good index fossil. Index fossils assist geologists and paleontologists to determine the age of rock layers. This is called biostratigraphy. It works like this. If you discover an ammonite from a genus More about the author understood to be from the Triassic Period, then the rock layer it came from must be Triassic. To be an excellent index fossil:

It should have wide circulation.

There must be a lot of them.

It needs to come from a visit here group that evolves rapidly.

They should be simple to acknowledge.

Ammonites satisfy all of the above requirements easily.

Extinction of The Ammonites
The end of the Cretaceous Period was also the end of the ammonites. Dinosaurs and many other types of animals and plants passed away out at about this same time.

The curled ammonite shells looked like 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 difficult shell of the ammonite was quickly fossilized. If you discover an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from should be Triassic. The end of the Cretaceous Period was also the end of the ammonites.

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