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



Ammonites have actually been understood to humanity for thousands of 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 imagined 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 associated special powers to this fossil.

In ancient Greece, it was stated that if you put an ammonite under your pillow it would cure 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 first appeared in the Devonian Period. Ammonites of later periods established septa that had actually elaborate folds called saddles and lobes. Ammonites such as Speetoniceras from Russia are great addition to a fossil collection often on auction.

Given that 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 links all the chambers in the shell with the living animal.

Ammonite Size
Ammonites have a wide variety of size. Early ammonites, till the middle Jurassic, were smaller, typically less than 9 inches or 23 centimeters.

Biostratigraphy
The hard shell of the ammonite was easily fossilized. This, combined with the sheer abundance of this group of cephalopods and its evolutionary duration through several geologic periods, make it an excellent 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 needs to have websites broad distribution.

There must be a great deal of them.

It should belong to a group that progresses rapidly.

They must be simple to recognize.

Ammonites satisfy all the above criteria quickly.

Termination of The Ammonites
The end of the Cretaceous Period was likewise the end of the ammonites. This had to do with 65 million years back. Dinosaurs and many other types of plants and animals passed away out at about this exact same time. It is thought that a big meteor colliding with earth triggered these mass extinctions.

The curled ammonite you can look here shells looked like the horns and were called Ammon's Stones or ammonites.

Ammonites of later durations developed septa that had detailed folds called saddles and lobes. The hard shell of the ammonite was easily fossilized. If you discover 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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