The Ammonites to Collect - (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 comes from the Egyptian god Ammon. Ammon was pictured as a male 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 actually been understood to mankind for thousands of years. The curled ammonite shells looked like the horns and were called Ammon's Stones or ammonites.

Ammonite Myths
Many 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 good dreams.

If you put a golden ammonite (pryritized) under your pillow you would have prophetic dreams, the Romans believed that.

A Brief History of Ammonites
Ammonites initially appeared in the Devonian Period. Ammonites of later periods established septa that had intricate folds called lobes and saddles. Ammonites such as Speetoniceras versicolor are great addition to a fossil collection often on sale.

Considering that 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. It can swim and manage its depth. It does this by utilizing the siphuncle. The siphuncle is a tube that links all the chambers in the shell with the living animal. The nautilus can subtract or include gas in these chambers to control buoyancy.

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

Biostratigraphy
The hard shell of the ammonite was easily fossilized. This, integrated with the sheer abundance of this group of cephalopods and its evolutionary period through a number of geologic periods, make it a great index fossil. If you discover an ammonite from a genus known to be from the Triassic Period, then the rock layer it came from should be Triassic.

It must have broad circulation.

There must be a lot of them.

It should come from a group that evolves quickly.

They must be simple to recognize.

Ammonites please all the above criteria easily.

Extinction of The Ammonites
The end of the Cretaceous click Period was view it now likewise the end of the ammonites. Dinosaurs and lots of other types of animals and plants 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 periods developed septa that had complex folds called lobes and saddles. The difficult 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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