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Rare Orthosphinctes (Ardescia) proinconditus Fossil Ammonite – Upper Oxfordian, Upper Jurassic, Grafenberg Bavaria Germany – Genuine + COA
Rare Orthosphinctes (Ardescia) proinconditus Fossil Ammonite – Upper Oxfordian, Upper Jurassic, Grafenberg Bavaria Germany – Genuine + COA - Image 2

Rare Orthosphinctes (Ardescia) proinconditus Fossil Ammonite – Upper Oxfordian, Upper Jurassic, Grafenberg Bavaria Germany – Genuine + COA

£60.00

A rare Orthosphinctes (Ardescia) proinconditus Fossil Ammonite, from the Upper Oxfordian Stage of the Upper Jurassic, collected at Grafenberg, Bavaria, Germany. This ammonite is a classic representative of the genus Orthosphinctes, known for its large, ribbed shell and stratigraphic importance in European Jurassic deposits. The specimen shown in the photographs is the exact one you will receive, and it is supplied with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Orthosphinctes (Ardescia) proinconditus
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Perisphinctidae

Geological Context:

  • Period: Jurassic
  • Epoch/Stage: Upper Jurassic – Upper Oxfordian (approx. 161 to 157.3 million years ago)
  • Biozone: Associated with the Bifurcatus Zone and related ammonite faunas, widely used in Oxfordian stratigraphy across Europe
  • Formation: Upper Oxfordian limestone successions of Bavaria
  • Depositional Environment: Marine platform environment with carbonate-rich sediments, ideal for ammonite fossilisation

Locality:

  • Region: Grafenberg, Bavaria, Germany

Morphology & Features:

  • Evolute shell with wide umbilicus
  • Strong, regularly spaced ribs extending across flanks and over the venter
  • Whorls with pronounced ornamentation, typical of Orthosphinctes
  • Large, robust form making it highly collectable

Scientific Notes:

  • Orthosphinctes proinconditus was first described in the 19th century during studies of Bavarian Jurassic ammonites
  • The genus Orthosphinctes is an important index genus for Upper Oxfordian biostratigraphy in central Europe

Notable Details:

  • Well-preserved specimen with strong ribbing and shell detail
  • Rare German ammonite from a historic fossil locality
  • 100% genuine, natural fossil with no restoration
  • Scale Reference: Each square or cube in the image = 1cm. Please see photos for exact sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Every specimen comes with a Certificate of Authenticity. The fossil pictured is the exact one you will receive.

 

This Orthosphinctes (Ardescia) proinconditus ammonite is a rare and scientifically valuable fossil from the Upper Oxfordian of Bavaria – an exceptional addition for collectors, researchers, or natural history displays.

 

(Actual as seen)

Only 1 left in stock

SKU: UF4306 Category:

Description

A rare Orthosphinctes (Ardescia) proinconditus Fossil Ammonite, from the Upper Oxfordian Stage of the Upper Jurassic, collected at Grafenberg, Bavaria, Germany. This ammonite is a classic representative of the genus Orthosphinctes, known for its large, ribbed shell and stratigraphic importance in European Jurassic deposits. The specimen shown in the photographs is the exact one you will receive, and it is supplied with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Orthosphinctes (Ardescia) proinconditus
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Perisphinctidae

Geological Context:

  • Period: Jurassic
  • Epoch/Stage: Upper Jurassic – Upper Oxfordian (approx. 161 to 157.3 million years ago)
  • Biozone: Associated with the Bifurcatus Zone and related ammonite faunas, widely used in Oxfordian stratigraphy across Europe
  • Formation: Upper Oxfordian limestone successions of Bavaria
  • Depositional Environment: Marine platform environment with carbonate-rich sediments, ideal for ammonite fossilisation

Locality:

  • Region: Grafenberg, Bavaria, Germany

Morphology & Features:

  • Evolute shell with wide umbilicus
  • Strong, regularly spaced ribs extending across flanks and over the venter
  • Whorls with pronounced ornamentation, typical of Orthosphinctes
  • Large, robust form making it highly collectable

Scientific Notes:

  • Orthosphinctes proinconditus was first described in the 19th century during studies of Bavarian Jurassic ammonites
  • The genus Orthosphinctes is an important index genus for Upper Oxfordian biostratigraphy in central Europe

Notable Details:

  • Well-preserved specimen with strong ribbing and shell detail
  • Rare German ammonite from a historic fossil locality
  • 100% genuine, natural fossil with no restoration
  • Scale Reference: Each square or cube in the image = 1cm. Please see photos for exact sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Every specimen comes with a Certificate of Authenticity. The fossil pictured is the exact one you will receive.

 

This Orthosphinctes (Ardescia) proinconditus ammonite is a rare and scientifically valuable fossil from the Upper Oxfordian of Bavaria – an exceptional addition for collectors, researchers, or natural history displays.

 

Additional information

Era

Jurassic
Origin

Germany

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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