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Prorsisphinctes meseres Fossil Ammonite – Lower Bajocian, Jurassic – Calvados, France | Authentic French Ammonite Fossil | COA Included
Prorsisphinctes meseres Fossil Ammonite – Lower Bajocian, Jurassic – Calvados, France | Authentic French Ammonite Fossil | COA Included - Image 2

Prorsisphinctes meseres Fossil Ammonite – Lower Bajocian, Jurassic – Calvados, France | Authentic French Ammonite Fossil | COA Included

£24.00

This listing features a RARE fossil ammonite specimen of Prorsisphinctes meseres from the Lower Bajocian Stage of the Middle Jurassic, sourced from Calvados, Normandy, France. This fossil represents a distinctive and important taxon from the early development of the family Perisphinctidae.

As with all our fossils, this is a 100% genuine specimen, carefully selected for its quality and authenticity. A Certificate of Authenticity (COA) is included. The exact fossil shown in the photographs is the one you will receive. Please refer to the scale image (1cm squares or cubes) for full sizing.

Fossil Overview:

  • Species: Prorsisphinctes meseres
  • Common Name: Fossil Ammonite
  • Geological Period: Jurassic
  • Stage: Lower Bajocian (~170–168 million years ago)
  • Formation: Likely from the lower part of the Bajocian clay or marl sequences
  • Location: Calvados, Normandy, France
  • Preservation: Internal mould with fine ribbing detail

Geological & Depositional Environment:

During the Lower Bajocian, this region of Normandy was submerged beneath a shallow epicontinental sea within the Paris Basin. The environment supported a rich marine ecosystem with thriving ammonite populations. These marine sediments are known for their excellent preservation of ammonoids in marl and limestone facies.

The ammonites from this stage mark a transition in faunal turnover after the Aalenian, reflecting evolutionary radiation events within the Perisphinctoidea.

Stratigraphy & Taxonomy:

  • Phylum: Mollusca
  • Class: Cephalopoda
  • Subclass: Ammonoidea
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Perisphinctidae
  • Genus: Prorsisphinctes
  • Species: meseres
  • Biozone: Early Bajocian zones, potentially within the Hyperlioceras discites or Laeviuscula zones

This species was formally described based on Bajocian specimens from western Europe, contributing to the identification of stratigraphic horizons in Jurassic basins.

Morphological Features:

  • Moderately evolute coiling with visible inner whorls
  • Prominent and regular bifurcating ribbing along the flanks
  • A distinct keel on the venter
  • Suture lines are complex but often only visible in cross section

These features point to a nektonic, fast-swimming lifestyle, with the animal likely an active predator in Jurassic seas.

Notable Points:

  • Represents an early lineage within the Perisphinctidae
  • Important for Jurassic biostratigraphy in western Europe
  • Beautiful ribbed morphology and excellent preservation
  • Sourced from a classic locality for Bajocian ammonites

Why Buy From Us?

  • All fossils are 100% genuine specimens
  • Includes a Certificate of Authenticity
  • You receive the exact fossil shown in the listing photos
  • Safe packaging and prompt dispatch

 

(Actual as seen)

Only 1 left in stock

SKU: UF4657 Category:

Description

This listing features a RARE fossil ammonite specimen of Prorsisphinctes meseres from the Lower Bajocian Stage of the Middle Jurassic, sourced from Calvados, Normandy, France. This fossil represents a distinctive and important taxon from the early development of the family Perisphinctidae.

As with all our fossils, this is a 100% genuine specimen, carefully selected for its quality and authenticity. A Certificate of Authenticity (COA) is included. The exact fossil shown in the photographs is the one you will receive. Please refer to the scale image (1cm squares or cubes) for full sizing.

Fossil Overview:

  • Species: Prorsisphinctes meseres
  • Common Name: Fossil Ammonite
  • Geological Period: Jurassic
  • Stage: Lower Bajocian (~170–168 million years ago)
  • Formation: Likely from the lower part of the Bajocian clay or marl sequences
  • Location: Calvados, Normandy, France
  • Preservation: Internal mould with fine ribbing detail

Geological & Depositional Environment:

During the Lower Bajocian, this region of Normandy was submerged beneath a shallow epicontinental sea within the Paris Basin. The environment supported a rich marine ecosystem with thriving ammonite populations. These marine sediments are known for their excellent preservation of ammonoids in marl and limestone facies.

The ammonites from this stage mark a transition in faunal turnover after the Aalenian, reflecting evolutionary radiation events within the Perisphinctoidea.

Stratigraphy & Taxonomy:

  • Phylum: Mollusca
  • Class: Cephalopoda
  • Subclass: Ammonoidea
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Perisphinctidae
  • Genus: Prorsisphinctes
  • Species: meseres
  • Biozone: Early Bajocian zones, potentially within the Hyperlioceras discites or Laeviuscula zones

This species was formally described based on Bajocian specimens from western Europe, contributing to the identification of stratigraphic horizons in Jurassic basins.

Morphological Features:

  • Moderately evolute coiling with visible inner whorls
  • Prominent and regular bifurcating ribbing along the flanks
  • A distinct keel on the venter
  • Suture lines are complex but often only visible in cross section

These features point to a nektonic, fast-swimming lifestyle, with the animal likely an active predator in Jurassic seas.

Notable Points:

  • Represents an early lineage within the Perisphinctidae
  • Important for Jurassic biostratigraphy in western Europe
  • Beautiful ribbed morphology and excellent preservation
  • Sourced from a classic locality for Bajocian ammonites

Why Buy From Us?

  • All fossils are 100% genuine specimens
  • Includes a Certificate of Authenticity
  • You receive the exact fossil shown in the listing photos
  • Safe packaging and prompt dispatch

 

Additional information

Era

Jurassic
Origin

France

Jurassic Information

The Jurassic Period (201–145 million years ago) was the golden age of dinosaurs, with iconic species like Brachiosaurus, Stegosaurus, and Allosaurus dominating the land. It was a time of warm, humid climates, with high sea levels that created vast shallow seas, supporting abundant marine reptiles, ammonites, and early coral reefs. The first birds, such as Archaeopteryx, evolved from small theropod dinosaurs, while early mammals remained small and nocturnal. Lush forests of cycads, conifers, and ferns covered the land, providing food for giant herbivores. The breakup of the supercontinent Pangaea accelerated, shaping Earth's geography and setting the stage for the diverse ecosystems of the Cretaceous.

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