Description
This listing is for a genuine fossil ammonite, Microsphinctes mitus, originating from the Oxfordian stage of the Late Jurassic (approximately 163–157 million years ago). Discovered in Vienne, France, this specimen has been carefully selected for its scientific value and attractive preservation. The photographs show the exact fossil you will receive. Scale rule squares / cube = 1 cm – please see the photos for accurate sizing. Every fossil we sell is 100% genuine and comes with a Certificate of Authenticity.
Geological Context: Oxfordian Stage of the Jurassic
The Oxfordian stage marks the beginning of the Late Jurassic and is known for its exceptionally diverse ammonite faunas. This period was characterised by extensive shallow seas across much of Europe, including what is now central France. The sediments laid down in these marine environments consisted of marls, clays, and limestones, providing ideal conditions for the preservation of ammonites and other marine life.
The region of Vienne, France, is well known for its Oxfordian deposits, which have produced a wide range of ammonite species. These fossils play a crucial role in stratigraphy, as ammonites from the Oxfordian are often used as index fossils to help date and correlate marine deposits across Europe.
The Species: Microsphinctes mitus
Microsphinctes mitus belongs to the order Ammonitida, superfamily Perisphinctoidea, and family Perisphinctidae. Ammonites in this group are distinguished by their planispiral shells with finely ribbed ornamentation.
The shell of M. mitus typically features compressed whorls with strong, closely spaced ribs that may bifurcate as they cross the flanks. These ribs provide both structural reinforcement and a striking visual pattern. The coiling is moderately involute, with the inner whorls partially obscured by the outer ones. This morphology reflects adaptations for buoyancy and movement in open marine waters.
As a nektonic predator, Microsphinctes mitus would have been an active swimmer in Jurassic seas, preying on smaller marine organisms such as crustaceans and molluscs. Its elegant shell design not only served a functional purpose but also makes it highly recognisable to paleontologists and collectors alike.
Morphological and Scientific Features
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Perisphinctidae
- Genus and Species: Microsphinctes mitus
- Geological Stage: Oxfordian, Late Jurassic (c. 163–157 Ma)
- Locality: Vienne, France
- Shell Traits: Planispiral shell, compressed whorls, strong ribbing, partially involute coiling
- Scientific Significance: Used as an index fossil for Oxfordian stratigraphy
The detailed ornamentation and shell proportions of M. mitus make it valuable for both paleontological research and private collections. Its role in defining biostratigraphic zones further enhances its scientific importance.
Collector and Display Value
This specimen of Microsphinctes mitus represents a beautifully preserved example of an Oxfordian ammonite from France. Its ribbed shell and elegant coiling make it highly desirable both as a natural display fossil and as a scientifically relevant piece.
Ammonites from the Oxfordian deposits of Vienne are especially sought after, as the locality is world-renowned for its fossil record and contribution to Jurassic stratigraphy. This fossil offers an opportunity to own a tangible piece of Earth’s history from over 160 million years ago.
All of our specimens are hand-selected for quality and authenticity. Supplied with a Certificate of Authenticity, this Microsphinctes mitus ammonite is a genuine and scientifically important fossil, perfect for collectors, educators, or enthusiasts of natural history.
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