Large Stephanoceras Ammonite from France

Stephanoceras sp Ammonite

Phylum Mollusca, Class Cephalopoda, Subclass Ammonoidea, Order Ammonitida, Superfamily Stephanocerataceae, Family Stephanoceratidae

Geological Time: Middle Jurassic (Bajocian Stage)

Size: Ammonite fossil is 9 cm in diameter

Fossil Site: Evircy, France

Fossil Code: PFA75

Price: $145.00


Stephanoceras Ammonite from FranceDescription: Stephanoceras are used as an index fossil to demarcate a geological time zone in the Jurassic period. Presented is a beautiful and large example of the classic species. It is big and fat, is excellently preserved, and retains some of it’s calcite skin. It rests comfortably within a flat matrix base. There has been no crushing or distortion to the specimen. This one would definitely compliment any serious ammonite collection.

Background: BAJOCIAN, in geology, the name proposed in 1849 by d'Orbigny for the rocks of Middle Jurassic age which are well developed in the neighborhood of Bayeux, Calvados. The Bajocian stage is practically equivalent to the Inferior Oolite of British geologists. It corresponds fairly closely with the Lower and Middle Brown Jura of Quenstedt, and with the Dogger of Oppel. By means of the fossil ammonites the Bajocia strata have been subdivided into the following zones, in descending order: Zone of Parkinsonia Parkinsoni and Cosmoceras garantianum "Coeloceras subcoronatum (Humphriesianum)" Sonninia Romani "Stephaeoceras Sowerbyi" Harpoceras concavum Murchisonae- Substage Aalenien opalinum = of Mayer-Eymar.

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