The Ammonites (Speetoniceras versicolor) - (Reference|Index} Fossils



Ammonites have been understood to humanity for thousands of years. They are the source of many stories and myths. The name of this spiral-shelled cephalopod comes from the Egyptian god Ammon. Ammon was imagined as a guy 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 actually been understood 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 associated unique powers to this fossil.

In ancient Greece, it was stated that if you put an ammonite under your pillow it would treat 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 actually complex folds called saddles and lobes. Ammonites such as from Russia are great addition to a fossil collection often on sale.

Because all living cephalopods (squid, nautilus, 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 connects all the chambers in the shell with the living animal.

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

Biostratigraphy
The tough shell of the ammonite was quickly fossilized. This, integrated with the sheer abundance of this group of cephalopods and its evolutionary duration through numerous geologic durations, make it a good index fossil. Index fossils assist geologists and paleontologists to identify the age of rock layers. This is called biostratigraphy. It works like this. If you find an ammonite from a genus known to be from the Triassic Period, then the rock layer it originated from should be Triassic. To be a great index fossil:

It should have large circulation.

There need to be a official site great deal of them.

It must belong to a group that progresses rapidly.

They must be simple to acknowledge.

Ammonites satisfy all the above criteria easily.

Termination of The Ammonites
The end of the Cretaceous Period was also the end of the ammonites. Dinosaurs and lots of other species of plants and animals passed away out at about this exact same time.

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 must be Triassic. The end of the Cretaceous Period was likewise the end of the ammonites.

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