ammonite with hematite - Fossilised animal - cleoniceras sp. - 180 mm - 140 mm






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A polished natural Cleoniceras sp. ammonite specimen with hematite from Madagascar, dating to the Cretaceous and measuring 180 × 140 × 46 mm.
Description from the seller
A very important fossil group dating to the Devonian-Cretaceous period. Totally extinct by the end of the Cretaceous, it is thought to derive from ancestors belonging to Nautiloidea. Although part of the cephalopod mollusks group, CLEONICERAS is distinguished above all by the shape of its shell characterized by bilateral symmetry. The shell is divided into an undivided anterior region where the animal resided and a posterior region divided into chambers. The line of suturing between the chambers is very indicative and facilitates species recognition. Moreover, its outline, in the early forms quite simple and linear, gradually changed to the more recent ammonites where it is often very jagged and almost baroque. The sizes vary: starting from a few centimeters but can reach up to 10 cm. Being a completely extinct marine species, it is only possible to hypothesize their lifestyle. It is believed that forms with externally smooth shells were swimmers, often predators. The species with more ribbed and ornamented shells were predominantly benthic.
Unmissable lot:
Impressive and splendid specimen of Cleoniceras sectioned to reveal the extraordinary internal structure, made possible by fossilization through silicification. The dark color typical of black hematite is visible, giving this ammonite a unique charm.
Observing the outer part of this beautiful fossil, one can clearly see the characteristic sutural lines of the species, interweaving into a pattern that recalls the sinuous movements of flames.
A true natural masterpiece.
pedestal not included, obtained from reclaimed materials used and intended solely for photographic purposes.
Seller's Story
A very important fossil group dating to the Devonian-Cretaceous period. Totally extinct by the end of the Cretaceous, it is thought to derive from ancestors belonging to Nautiloidea. Although part of the cephalopod mollusks group, CLEONICERAS is distinguished above all by the shape of its shell characterized by bilateral symmetry. The shell is divided into an undivided anterior region where the animal resided and a posterior region divided into chambers. The line of suturing between the chambers is very indicative and facilitates species recognition. Moreover, its outline, in the early forms quite simple and linear, gradually changed to the more recent ammonites where it is often very jagged and almost baroque. The sizes vary: starting from a few centimeters but can reach up to 10 cm. Being a completely extinct marine species, it is only possible to hypothesize their lifestyle. It is believed that forms with externally smooth shells were swimmers, often predators. The species with more ribbed and ornamented shells were predominantly benthic.
Unmissable lot:
Impressive and splendid specimen of Cleoniceras sectioned to reveal the extraordinary internal structure, made possible by fossilization through silicification. The dark color typical of black hematite is visible, giving this ammonite a unique charm.
Observing the outer part of this beautiful fossil, one can clearly see the characteristic sutural lines of the species, interweaving into a pattern that recalls the sinuous movements of flames.
A true natural masterpiece.
pedestal not included, obtained from reclaimed materials used and intended solely for photographic purposes.
