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



Ammonites have actually been known to humanity for thousands of years. They are the source of lots of stories and myths. The name of this spiral-shelled cephalopod originates from the Egyptian god Ammon. Ammon was imagined 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 been known to humanity 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 actually attributed 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 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. Early curled types had simple septa with a single arc like the members of the class orthocerida. Ammonites of later durations established septa that had actually elaborate folds called saddles and lobes. They likewise developed delicate lacey patterns on the outer shell. These patterns in addition to the shape of the shell and the structure of the septa are how this cephalopod is categorized. Ammonites such as Speetoniceras from Russia are great addition to a fossil collection often on auction.

Since all living cephalopods (squid, nautilus, and octopus) are predators, we can presume 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 utilizing the siphuncle. The siphuncle is a tube that connects all the chambers in the shell with the living animal. The nautilus can add or subtract gas in these chambers to manage buoyancy.

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

Biostratigraphy
The tough shell of the ammonite was easily fossilized. This, integrated with the large abundance of this group of cephalopods and its evolutionary duration through numerous geologic periods, make it an excellent index fossil. If you find an ammonite from a genus understood to be from the Triassic Period, then the rock layer it came from must be Triassic.

It should have large distribution.

There need to be a lot of them.

It should belong to a group that develops quickly.

They must be easy to acknowledge.

Ammonites satisfy all the above criteria easily.

Termination this page of The Ammonites
The end of the Cretaceous Period was also the end of the ammonites. Dinosaurs and numerous other types of plants and animals died out at about this exact same time.

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

Ammonites of later periods developed septa that had complex folds called saddles and lobes. The hard shell of the ammonite was easily 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 likewise the end of the ammonites.

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