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



Ammonites have actually been understood to humanity for thousands of years. They are the source of lots of stories and myths. The name of this spiral-shelled cephalopod comes 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 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
Numerous cultures throughout history have actually attributed 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 good dreams.

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

A Brief History of Ammonites
Ammonites initially appeared in the Devonian Period. Early curled types had easy septa with a single arc like the members of the class orthocerida. Ammonites of later periods established septa that had actually elaborate folds called saddles and lobes. They also developed delicate lacey patterns on the outer shell. These patterns along with the shape of the shell and the structure of the septa are how this cephalopod is categorized. Ammonites such as Russian Speetoniceras are highly collectible fossils often on auction.

Since all living cephalopods (nautilus, octopus, and squid) 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 by using the siphuncle. The siphuncle is a tube that links all the chambers in the shell with the living animal. The nautilus look at more info can deduct or include gas in these chambers to control buoyancy.

Ammonite Size
Ammonites have a vast array of size. Specimens have actually been found ranging from less than a centimeter to 2 meters in diameter. Early ammonites, up until the middle Jurassic, were smaller sized, generally less than 9 inches or 23 centimeters. Throughout the upper Jurassic and lower Cretaceous bigger varieties can be discovered. Titanites found in the south of England can be over 50 centimeters, 2 feet in size.

Biostratigraphy
The tough shell of the ammonite was easily fossilized. This, integrated with the large abundance of this group of cephalopods and its evolutionary period through numerous 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 Home Page rock layer it came from need to be Triassic.

It must have wide circulation.

There must be a lot of them.

It needs to belong to a group that progresses 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 also completion of the ammonites. This had to do with 65 million years ago. Dinosaurs and numerous other types of plants and animals passed away out at about this very same time. It is thought that a big meteor colliding with earth caused these mass terminations.

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

Ammonites of later durations developed septa that had complex folds called saddles and lobes. The hard shell of the ammonite was easily fossilized. If you discover an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from must be Triassic. The end of the Cretaceous Period was also the end of the ammonites.

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