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Dimensions
3.5"/85mm
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Polished Cleoniceras Madagascan Fossil Ammonite - NA0012 | ||
| £13.00 | |||
Description
Excellently polished Cleoniceras Madagascan Ammonite revealing the Suture Patterning [the under-shell layer of the Ammonite], This showing the fascinating and complexity of the anatomy of the once living swimming Cephalopod. The many chambers of the Cephalopod lie under the suture patterning. As you will see on the other cut and polished varieties through our online catalogue. The Ammonite added a new chamber as it grew living in the last and therefore largest Living Chamber.
Brief Ammonite History
Ammonites, part of the Ammonitida [order], Ammonoidea [sub class], Cephalopoda [class], of marine invertebrates were fascinating and believed to be aggressive creatures, with their extremely large eyes they could easily hunt at night or at great depth where little or no light penetrates the deep oceans much as the persisting modern day Nautilus Pompilius [Emperor Nautilus], which swims the Pacific.
at a depth of between 200-400m Off the Great Barrier reef sightings of Nautilus have been made. Showing the pressures these Cephalopods can attain. Suture Patterning, suture patterning the complex ,in some cases, almost frilly patterning on the surface of polished fossil ammonoid specimens, is in fact the markings from underside of the shell interlocking system of the cephalopod, which gives the living Cephalopod greater strength enabling it to resist the great pressures at great depth. The Ammonites extinction was around 74 mya, pre the great mass extinction of around 65 mya, at the end of the Cretaceous Period which ended the rule of the dinosaurs. Ammonites are a very important Index Fossil, it is often possible to link the sediment layer in which they are found to specific geological time periods. The largest ammonite found to date was around 76 diameter, found in Germany. Ammonite, Named [by the Greek ancients Ammon], after the Egyptian God deity Amun, with his ram horn ears, similar to the concentrically formed Ammonite shell. Closet modern relatives [subclass Coleoidea], octopus, squid, and cuttlefish.