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Evolution - Ammonite 1000 Tugriks...
Evolution - Ammonite 1000 Tugriks (Tögrög) 99.99% gold coin, proof.
A small gold coin featuring an ammonite in detailed relief complements the popular first silver issue of the Evolution of Life series. First coin in series. Timeless topic.
Mintage: 15,000 pieces worldwide. Coin in capsule.
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|Face Value :||1,000 Tugriks|
|Metal :||Gold 99.99%|
|Weight :||0.5 g|
|Size :||11.00 mm|
|Mintage :||15,000 pcs. worldwide|
|Certificate of Authenticity :||No|
|Wooden Box :||No|
|Original ETUI box/case :||No|
Ammonites are an extinct group of marine invertebrate animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out during the Cretaceous–Paleogene extinction event.
Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geological time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms (known as heteromorphs).
The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder (d. 79 AD near Pompeii) called fossils of these animals ammonis cornua ("horns of Ammon") because the Egyptian god Ammon (Amun) was typically depicted wearing ram's horns. Often the name of an ammonite genus ends in -ceras, which is Greek (κέρας) for "horn".
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