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



Ammonites have been understood to humanity for countless 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 envisioned as a male with the horns of a ram extending 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 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 attributed special 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 great 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 first appeared in the Devonian Period. Early curled species had basic septa with a single arc like the members of the class orthocerida. Ammonites of later durations developed septa that had elaborate folds called lobes and saddles. They likewise established 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 Speetoniceras are highly collectible fossils often on sale.

Because all living cephalopods (squid, octopus, and nautilus) are predators, we can presume that ammonites were also. 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 subtract 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 you could try these out to 2 meters in size. Early ammonites, up until the middle Jurassic, were smaller, normally less than 9 inches or 23 centimeters. Throughout the upper Jurassic and lower Cretaceous larger varieties can be found. Titanites discovered in the south of England can be over 50 centimeters, 2 feet in size.

Biostratigraphy
The hard shell of the ammonite was easily fossilized. This, combined with the large abundance of this group of cephalopods and its evolutionary period through numerous geologic durations, make it a good index fossil. Index fossils help paleontologists and geologists to identify the age of rock layers. This is called biostratigraphy. It works like this. 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. To be a great index fossil:

It should have broad circulation.

There should be a lot of them.

It should belong to a group that develops rapidly.

They must be simple to acknowledge.

Ammonites please all the above criteria easily.

Extinction of The Ammonites
The end of the Cretaceous Period was likewise completion of the ammonites. This had to do with 65 million years back. Dinosaurs and numerous other species of plants and animals passed away out at about this very same time. It is believed that a substantial meteor hitting earth visit this page caused these mass extinctions.

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

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Comments on “The Ammonites (Russian Speetoniceras) - (Reference|Index} Fossils”

Leave a Reply

Gravatar