Description
This listing is for a genuine fossil ammonite, Decipia decipiens, from the Middle Callovian stage of the Jurassic Period (approximately 165–164 million years ago). Discovered in France, this specimen represents a classic ammonite from one of the most significant stages of the Jurassic. The fossil shown in the photographs is the exact specimen you will receive, carefully chosen for its preservation and detail. Scale rule squares / cube = 1 cm – please refer to the photos for accurate sizing. Every fossil is 100% genuine and is supplied with a Certificate of Authenticity for guaranteed confidence in your purchase.
Geological Context: Middle Callovian, Jurassic
The Callovian stage is a key division of the Middle Jurassic and is particularly important for ammonite biostratigraphy. During this time, much of Europe, including present-day France, was covered by shallow seas connected to the Tethys Ocean. Fine marine sediments such as clays and marls accumulated, creating excellent conditions for fossil preservation.
The Middle Callovian is especially rich in ammonite faunas and has long been used as a standard reference for correlating Jurassic rock sequences across Europe. Fossils like Decipia decipiens are important index fossils, meaning they can be used to precisely date and align rock layers from different locations.
The Species: Decipia decipiens
Decipia decipiens belongs to the order Ammonitida, superfamily Stephanoceratoidea, and family Stephanoceratidae. Ammonites of this group are characterised by their strong ribbing, pronounced ornamentation, and detailed suture lines. The genus Decipia is particularly recognisable due to its elegant rib patterns and compressed whorl structure, making it a significant taxon within the Callovian ammonite record.
The shell of D. decipiens typically displays bifurcating ribs that radiate across the whorl, giving the fossil a bold and decorative appearance. This distinctive ornamentation is both aesthetically appealing and a critical feature for scientific identification. Like other ammonites, Decipia decipiens was a nektonic predator, living in open marine waters and preying upon smaller invertebrates.
Morphological and Scientific Features
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Stephanoceratidae
- Genus and Species: Decipia decipiens
- Geological Stage: Middle Callovian, Jurassic (c. 165–164 Ma)
- Locality: France
- Shell Traits: Planispiral coiling, bifurcating ribs, compressed whorls, striking ornamentation
- Scientific Significance: Index fossil for Middle Callovian biozones, key to Jurassic stratigraphy
The distinctive ribbing and morphology of Decipia decipiens make it an important species for paleontologists, helping to define biozones within the Callovian stage and refine the Jurassic timescale.
Collector and Display Value
Ammonites such as Decipia decipiens are highly sought after by collectors for their combination of scientific importance and natural beauty. The strong ribbing and well-preserved coiling make this species particularly attractive as a display fossil, while its role as an index fossil enhances its significance to anyone with an interest in paleontology.
Specimens from France’s Callovian deposits are especially prized, as the region has long been a reference point for Jurassic ammonite studies. This fossil represents not just a beautiful natural specimen but also an important piece of paleontological history.
All of our fossils are carefully chosen, fully authentic, and supplied with a Certificate of Authenticity. This Decipia decipiens ammonite is a fine example of Middle Jurassic heritage, ideal for collectors, educators, and enthusiasts of Earth’s prehistoric past.
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