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



Ammonites have been known to mankind 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 pictured 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 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 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. Ammonites of later durations established septa that had actually detailed folds called saddles and lobes. Ammonites such as Speetoniceras are great addition to a fossil collection often on sale.

Since all living cephalopods (octopus, nautilus, and squid) 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 large variety of size. Early ammonites, up until the middle Jurassic, were smaller, usually less than 9 inches or 23 centimeters.

Biostratigraphy
The difficult shell of the ammonite was easily fossilized. This, combined with the large abundance of this group of cephalopods and its evolutionary period through a number of 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 large circulation.

There must be a great deal of them.

It needs to come from a you could try this out group that develops rapidly.

They should be simple to recognize.

Ammonites satisfy all the above criteria easily.

Termination of The Ammonites
The end of the Cretaceous Period was likewise the end of the ammonites. Dinosaurs and numerous other species of animals and plants passed away out at about this 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 detailed folds called lobes and saddles. 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 should be Triassic. The end of the Cretaceous Period was also the end of the ammonites.

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