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Olcostephanus Fossil Ammonite – Lower Hauterivian, Cretaceous, Drôme France – Genuine + COA
Olcostephanus Fossil Ammonite – Lower Hauterivian, Cretaceous, Drôme France – Genuine + COA - Image 2

Olcostephanus Fossil Ammonite – Lower Hauterivian, Cretaceous, Drôme France – Genuine + COA

£60.00

A well-preserved Olcostephanus Fossil Ammonite, from the Lower Hauterivian Stage of the Cretaceous Period, collected in Drôme, France. This specimen represents one of the most characteristic genera of the Lower Cretaceous, with finely ribbed ornamentation and excellent preservation. The exact fossil pictured is the one you will receive, and it comes with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Genus: Olcostephanus (species not specified)
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Olcostephanidae

Geological Context:

  • Period: Cretaceous
  • Epoch/Stage: Lower Cretaceous – Hauterivian (approx. 132.9 to 129.4 million years ago)
  • Biozone: Commonly associated with Olcostephanus faunas of the Lower Hauterivian used in European ammonite biostratigraphy
  • Depositional Environment: Marine shelf environment with alternating limestones and marls, excellent conditions for ammonite fossilisation

Locality:

  • Region: Drôme, France
  • Formation: Hauterivian limestone-marl successions of SE France (specific unit unconfirmed)

Morphology & Features:

  • Evolute shell with moderately wide umbilicus
  • Strong, closely spaced ribs extending across the flanks and uninterrupted over the venter
  • Fine ornamentation typical of the genus Olcostephanus
  • Distinctive ribbing makes it an easily recognisable ammonite

Scientific Notes:

  • The genus Olcostephanus was first described by Neumayr (1875) and has since been an important zonal genus for Lower Cretaceous ammonite classification
  • Widely used as an index fossil, helping define several Hauterivian zones across Europe

Notable Details:

  • Excellent preservation of ribs and shell morphology
  • Entirely natural specimen with no restoration
  • Scale Reference: Each square or cube = 1cm. Please see the photo for accurate fossil sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. A Certificate of Authenticity is included with your purchase. The fossil shown is the exact specimen you will receive.

 

This Olcostephanus ammonite is a fine example of a Lower Cretaceous ammonite, ideal for collectors, natural history displays, or educational purposes.

 

(Actual as seen)

Only 1 left in stock

SKU: UF4286 Category:

Description

A well-preserved Olcostephanus Fossil Ammonite, from the Lower Hauterivian Stage of the Cretaceous Period, collected in Drôme, France. This specimen represents one of the most characteristic genera of the Lower Cretaceous, with finely ribbed ornamentation and excellent preservation. The exact fossil pictured is the one you will receive, and it comes with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Genus: Olcostephanus (species not specified)
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Olcostephanidae

Geological Context:

  • Period: Cretaceous
  • Epoch/Stage: Lower Cretaceous – Hauterivian (approx. 132.9 to 129.4 million years ago)
  • Biozone: Commonly associated with Olcostephanus faunas of the Lower Hauterivian used in European ammonite biostratigraphy
  • Depositional Environment: Marine shelf environment with alternating limestones and marls, excellent conditions for ammonite fossilisation

Locality:

  • Region: Drôme, France
  • Formation: Hauterivian limestone-marl successions of SE France (specific unit unconfirmed)

Morphology & Features:

  • Evolute shell with moderately wide umbilicus
  • Strong, closely spaced ribs extending across the flanks and uninterrupted over the venter
  • Fine ornamentation typical of the genus Olcostephanus
  • Distinctive ribbing makes it an easily recognisable ammonite

Scientific Notes:

  • The genus Olcostephanus was first described by Neumayr (1875) and has since been an important zonal genus for Lower Cretaceous ammonite classification
  • Widely used as an index fossil, helping define several Hauterivian zones across Europe

Notable Details:

  • Excellent preservation of ribs and shell morphology
  • Entirely natural specimen with no restoration
  • Scale Reference: Each square or cube = 1cm. Please see the photo for accurate fossil sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. A Certificate of Authenticity is included with your purchase. The fossil shown is the exact specimen you will receive.

 

This Olcostephanus ammonite is a fine example of a Lower Cretaceous ammonite, ideal for collectors, natural history displays, or educational purposes.

 

Additional information

Era

Cretaceous
Origin

France

Cretaceous Information

The Cretaceous Period (145–66 million years ago) was the final era of the Mesozoic, marked by the dominance of dinosaurs and the rise of flowering plants. It had a warm, greenhouse climate, with high sea levels that created vast shallow inland seas. Marine life flourished, including mosasaurs, ammonites, and rudist reefs, while the land was ruled by iconic dinosaurs like Tyrannosaurus rex, Triceratops, and Spinosaurus. Mammals and birds diversified, and insects thrived. The period ended with the mass extinction event, likely caused by an asteroid impact, wiping out the dinosaurs and paving the way for the rise of mammals in the Cenozoic.

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