Ammonite (Perisphinctes Kranaosphinctes ?) Ammonite (Perisphinctes Kranaosphinct…

Description

Ammonite (Perisphinctes Kranaosphinctes ?)

Ammonite (Perisphinctes Kranaosphinctes ?) Shell, ca. 157-163 million years old, Madagascar Fossil 40x36x18 cm Provenance: market (Italy) Conservation status. Surface area: 60% (large gaps) Conservation status. Support: 70% (gaps, consolidation) Perisphinctes is an extinct genus of ammonite. These ammonites lived during the Middle and Upper Jurassic and serve as an index fossil for that time period. The specimen can be traced back to the subgenus Kranaosphinctes, which was widespread in the Upper Jurassic (161.2-155.7 million years ago) only, and which some authors consider an extinct genus belonging to the family Perisphinctidae. It belongs to the oxfordian or kimmeridgian stage and comes from Madagascar.

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Ammonite (Perisphinctes Kranaosphinctes ?)

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CLEONICERAS FOSSIL AMMONITE FROM MADAGASCAR Fossil ammonite belonging to the extinct Cleoniceras cephalopod mollusks. An attractive, large specimen presented on a base in the form of a longitudinal section, revealing the crystallized elements of the internal cavities of this marine cephalopod mollusk. A mechanical polishing operation has been carried out, destructuring the external part of this mollusc to give it an aesthetic appearance. Dating on the geological time scale (fossiliferous) probably Upper Cretaceous-Albian (113-100.5 mA). This ammonite specimen was collected in Madagascar (Majunga region, northern Madagascar). Weight : 1eR : 440 g. - 15.52 oz - 2e : 454 g. - 16.01 OZ With base: HEIGHT. 21 - WIDTH. 13 - PROF. 8 CM - H. 8,2 - W. 5,1 - D. 3,1 IN. Without base: HEIGHT. 16 - WIDTH. 13 - PROF. 8 CM - H. 6,2 - w. 5.1 - d. 3,1 IN. This species of marine cephalopod fossil mollusc is not subject to regulation under the Washington Convention (CITES), European Community Regulation 338/97 of 09/12/1996, and the French Environment Code. A base-mounted ammonite cleoniceras, Majunga, Madagascar, Upper Cretaceous (-110 million years)

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Minéralogie

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