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RARE Arisphinctes helenaes Fossil Ammonite – Middle Oxfordian – Jurassic – LE VANNEAU, Deux-Sèvres, France – Genuine Specimen with COA
£14.40
Presenting a RARE and genuine fossil ammonite of the species Arisphinctes helenaes from the Middle Oxfordian stage of the Jurassic Period, unearthed in Le Vanneau, Deux-Sèvres, France. This beautifully preserved fossil is a superb example of Middle Jurassic ammonite diversity, showcasing the intricate shell features characteristic of the Arisphinctes genus.
- Fossil Type: Ammonite (extinct marine cephalopod)
- Species: Arisphinctes helenaes
- Geological Period: Jurassic
- Geological Stage: Middle Oxfordian (~160 million years ago)
- Locality: Le Vanneau, Deux-Sèvres, France
- Formation: Oxfordian marine limestone and marl strata, typical of the region
Scientific and Geological Details:
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Perisphinctidae
- Morphology Features:
- Moderately involute shell with fine, bifurcating ribbing
- Whorls are compressed, showing typical evolute form
- Suture lines moderately complex, in line with Oxfordian ammonites
- Depositional Environment:
- Shallow epicontinental seas of the Tethys margin
- Fossil preserved in calcareous marine sediment, indicating a relatively low-energy depositional setting
- Biozone:
- Likely within the Arisphinctes biozone of the Oxfordian ammonite zonation
- Notable:
- Arisphinctes helenaes is a significant zonal index fossil for the Middle Oxfordian in Western Europe
- Species described as part of regional ammonite faunas used in refining Jurassic chronostratigraphy
- Formally Described By: Specific taxonomic authority not conclusively recorded for this locality; often included in classic Oxfordian ammonite catalogues such as those by W. J. Arkell
Why This Fossil Is a Standout Specimen:
- A rare and highly collectible ammonite species
- Authentic fossil with distinct ornamentation
- Offers excellent insight into mid-Oxfordian marine life
- Ideal for collectors, display, teaching or paleontology reference
- Sourced from a scientifically important Jurassic site in western France
Additional Information:
- All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity
- Scale Rule Squares / Cube = 1cm: Full sizing please see photo
- This listing includes the exact specimen shown – no stock images used. Your piece has been hand-selected for its quality and clarity
(Actual as seen)
Out of stock
Description
Presenting a RARE and genuine fossil ammonite of the species Arisphinctes helenaes from the Middle Oxfordian stage of the Jurassic Period, unearthed in Le Vanneau, Deux-Sèvres, France. This beautifully preserved fossil is a superb example of Middle Jurassic ammonite diversity, showcasing the intricate shell features characteristic of the Arisphinctes genus.
- Fossil Type: Ammonite (extinct marine cephalopod)
- Species: Arisphinctes helenaes
- Geological Period: Jurassic
- Geological Stage: Middle Oxfordian (~160 million years ago)
- Locality: Le Vanneau, Deux-Sèvres, France
- Formation: Oxfordian marine limestone and marl strata, typical of the region
Scientific and Geological Details:
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Perisphinctidae
- Morphology Features:
- Moderately involute shell with fine, bifurcating ribbing
- Whorls are compressed, showing typical evolute form
- Suture lines moderately complex, in line with Oxfordian ammonites
- Depositional Environment:
- Shallow epicontinental seas of the Tethys margin
- Fossil preserved in calcareous marine sediment, indicating a relatively low-energy depositional setting
- Biozone:
- Likely within the Arisphinctes biozone of the Oxfordian ammonite zonation
- Notable:
- Arisphinctes helenaes is a significant zonal index fossil for the Middle Oxfordian in Western Europe
- Species described as part of regional ammonite faunas used in refining Jurassic chronostratigraphy
- Formally Described By: Specific taxonomic authority not conclusively recorded for this locality; often included in classic Oxfordian ammonite catalogues such as those by W. J. Arkell
Why This Fossil Is a Standout Specimen:
- A rare and highly collectible ammonite species
- Authentic fossil with distinct ornamentation
- Offers excellent insight into mid-Oxfordian marine life
- Ideal for collectors, display, teaching or paleontology reference
- Sourced from a scientifically important Jurassic site in western France
Additional Information:
- All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity
- Scale Rule Squares / Cube = 1cm: Full sizing please see photo
- This listing includes the exact specimen shown – no stock images used. Your piece has been hand-selected for its quality and clarity
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