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$24.00 USD
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3739
5

20.85 CTS AMMONITE INDONESIAN -WELL POLISHED [MGW4078]

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x x mm
重量 (cts)
Certified Gemstones
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MINERAL GEM WORLD

INDONESIAN AMMONITE

 

This is a colourful natural untreated specimen of ammonite from Indonesia.

They can be kept as a specimen or drilled and made into colourful pendants.

Well polished

Weight 20.85 cts app

Size 18 x 16 x 11 mm app


 

Ammonites, as they pertain specifically to the order Ammonitida, are an extinct group of marine animals belonging to the cephalopod subclass Ammonoidea. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods.

The closest living relative of the Ammonitida, is not the modern Nautilus which they somewhat outwardly resemble, but rather the subclass Coleoidea (octopus, squid, and cuttlefish).

Their fossil shells usually take the form of planispirals, although there were some helically-spiraled and non-spiraled forms (known as "heteromorphs"). Their name came from their spiral shape as their fossilized shells somewhat resemble tightly-coiled rams' horns. 

 



Other fossils, such as many found in Madagascar and Alberta (Canada), display iridescence. These iridescent ammonites are often of gem quality (ammolite) when polished. In no case would this iridescence have been visible during the animal's life; additional shell layers covered it.

Ammonite fossils became less abundant during the latter part of the Mesozoic, with none surviving into the Cenozoic era. The last surviving lines disappeared along with the dinosaurs 65 million years ago in the Cretaceous-Tertiary extinction  event. That no ammonites survived the extinction event at the end of the Cretaceous, while some nautiloid cousins survived, might be due to differences in ontogeny. If their extinction was due to a bolide strike, plankton around the globe could have been severely diminished, thereby dooming ammonite reproduction during its planktonic stage.

 

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sedagems
sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
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  • js20031
    js20031
    积极的

    AAAA+++ Very Happy! Just like the pic.

  • js20031
    js20031
    积极的

    AAAA+++ Very Happy! Just like the pic.

  • wesam
    wesam
    积极的

    Very nice stone

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列表类型 : Standard
产品编号 : 398772
开始 : 25th October 2024 10:00 pm PDT
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