A Lytoceras sutured ammonite discovered in the fossiliferous layers of the Cretaceous period of Madagascar. The myriad of suture patterning of this polished specimen is exceptional of its type. The sutures are the divisions of growth of the cephalopods shell developing each frilly suture which records the marine animals progress through its life cycle, adding each new larger suture as the cephalopod created chitin-polymer matrix, to its growing home, the outer shell.
The lytoceras is a cephalopod related to octopi, both are molluscs. Sutures were attached to the inner shell wall. When fossil ammonoids are cleaned and polished the sutures can become apparent. This type of characteristic is particularly beautiful in the location of this fossil find from the Cretaceous and Jurassic layers in the Madagascan island. In our opinion some of the finest fossils for polishing are sourced from the Island of Madagascar.
The delicate sutures are filled with coloured minerals calcites and jaspers, in this specimen dark rich browns and mustards tones, all semi precious minerals of quartz family. The fossilised shell itself has a good and fully three dimensional or inflated shape and is of a good size for the type. A recommended investment in a quality ammonoid of a fairly scarce fossil grade.
Lytoceras ammonites, a member of the ammonoid family in the greater group of cephalopoda, were marine dwellers which once filled the prehistoric Cretaceous oceans. When the cephalopods died the shells eventually sank into the sea bottoms, silts covered the shells quickly creating a anoxic environment. The shell petrified absorbing localised environmental minerals into the chitin shell and over a long period fossilised in layers of solidified limestone. Millions of ammonoids died over hundreds of millions of years, that fact makes these fossils amazing, as most have been crushed and simply worn away over time. To discover a fully inflated, three dimensional shell shape is a very rare event in the numbers scheme of things.