Ammonites are a type of marine cephalopod mollusk from the subclass Ammonoidea.
Their fossils show that the ammonites had spiral striped shells, at the end of which lived a tentacled animal. These sea creatures lived from 400 to 65 million years ago. They became extinct along with the dinosaurs, in the Cretaceous-Paleogene mass extinction event. Their closest living relatives are the octopus, squid, cuttlefish and the Nautilus.
Nine orders of Ammonoidea have been found and identified: five from the Palaeozoic Era and four from the Mesozoic Era.
Evolution :
Ammonites first appeared during the Early Devonian. They evolved from small, straight-shelled Bactridians, which were early nautiloids. They quickly evolved into a variety of shapes and sizes, including odd shapes such as hairpins.
AMAZING PERMIAN AMMONITE FROM DEMOCRATIC REPUBLIC TIMOR LESTE
Item specifics
Condition : Collection since 1997
Shape : natural
Country/Region of manufacture : Indonesia/ Bandung West Java
Material : Carbonate (CaCO3)
Type : Rough
Weight : 6Gr
Size : 2 x 1.7 x 1.4 Cm
Description Product
Location : Democratic Republic of Timor Leste
Kingdom : Animalia
Phyllum : Mollusca
Class : Cephalopoda
Sub-class : Ammonoidea
Order : Ammonitida (Ammonite)
Age : Permian (280-225 million years)
Brief Backround Product / Stone
This Ammonite fossil was collected in october 1997 from East Timor of Indonesia (Before its indenpendence in 2002 to become Democratic Republic of Timor Leste). It was found in red shale rock formation intercalated of Permian age (280 – 225 million years). Almost all of its chambers filled with crystal of calcite.
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