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Geisonoceras Orthoceras Fossil Orthocone | Middle Devonian Eifelian Morocco | Genuine Specimen with COA
Geisonoceras Orthoceras Fossil Orthocone | Middle Devonian Eifelian Morocco | Genuine Specimen with COA - Image 2

Geisonoceras Orthoceras Fossil Orthocone | Middle Devonian Eifelian Morocco | Genuine Specimen with COA

Original price was: £14.40.Current price is: £12.96.

Add a captivating piece of prehistoric marine life to your fossil collection with this genuine Geisonoceras (formerly grouped under Orthoceras) fossil orthocone from the Middle Devonian period, specifically the Eifelian stage, unearthed in the famous fossil-rich region near Alnif, Erfoud, Morocco. This exceptional specimen displays the long, chambered shell structure characteristic of ancient nautiloid cephalopods.

Fossil Type: Orthocone Cephalopod

Genus: Geisonoceras (previously Orthoceras)

Geological Period: Middle Devonian (~393 to 388 million years ago)

Geological Stage: Eifelian

Location: Alnif, near Erfoud, Anti-Atlas Mountains, Morocco

Scale Rule: Squares/Cube = 1cm (Please see photo for full sizing)

Specimen: Actual fossil shown in the photo is what you will receive

Authenticity: All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity

Geological and Paleontological Context

Geisonoceras is a genus of extinct nautiloid cephalopods from the Order Orthocerida, known for its long, straight (orthoconic) shell composed of internal chambers. These marine invertebrates lived in open marine settings and played an important role in the Paleozoic marine ecosystem.

  • Phylum: Mollusca
  • Class: Cephalopoda
  • Order: Orthocerida
  • Family: Geisonoceratidae
  • Superfamily: Orthocerataceae
  • Geological Stage: Eifelian (Middle Devonian)
  • Depositional Environment: Shallow marine shelf; fossil typically preserved in grey to black limestone indicative of low-energy sedimentation in a carbonate platform environment
  • Morphological Features: Long, slender conical shell (orthocone) with visible internal septa and a siphuncle running longitudinally through the chambers; polished specimens reveal exquisite detail of these features
  • Notable: Geisonoceras is distinguished from similar genera by the structure of its siphuncle and the spacing of septa. These orthocones are often used as biostratigraphic markers in Devonian carbonates
  • Biozone: Not specifically assigned without exact stratigraphic data
  • Identifier: Initially described and differentiated from Orthoceras by 19th-century paleontologists refining nautiloid classification

Why This Fossil Stands Out

This stunning Geisonoceras specimen has been carefully chosen and polished to enhance its natural features. It provides a detailed view of the phragmocone (chambered shell), ideal for both educational purposes and display. Sourced from one of the most prolific fossil sites in North Africa, it exemplifies the diversity and preservation quality of Devonian marine fossils.

Why Buy From Us?

  • 100% genuine fossil with Certificate of Authenticity
  • Specimen shown is the exact item you will receive
  • Sourced from trusted suppliers in Morocco
  • Perfect for collectors, educators, or as a striking natural display piece

Own a real relic of Earth’s ancient oceans — this Geisonoceras orthocone fossil from the Middle Devonian Eifelian stage of Morocco brings prehistoric marine history to life in stunning form.

(Actual as seen)

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SKU: UF3368 Category:

Description

Add a captivating piece of prehistoric marine life to your fossil collection with this genuine Geisonoceras (formerly grouped under Orthoceras) fossil orthocone from the Middle Devonian period, specifically the Eifelian stage, unearthed in the famous fossil-rich region near Alnif, Erfoud, Morocco. This exceptional specimen displays the long, chambered shell structure characteristic of ancient nautiloid cephalopods.

Fossil Type: Orthocone Cephalopod

Genus: Geisonoceras (previously Orthoceras)

Geological Period: Middle Devonian (~393 to 388 million years ago)

Geological Stage: Eifelian

Location: Alnif, near Erfoud, Anti-Atlas Mountains, Morocco

Scale Rule: Squares/Cube = 1cm (Please see photo for full sizing)

Specimen: Actual fossil shown in the photo is what you will receive

Authenticity: All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity

Geological and Paleontological Context

Geisonoceras is a genus of extinct nautiloid cephalopods from the Order Orthocerida, known for its long, straight (orthoconic) shell composed of internal chambers. These marine invertebrates lived in open marine settings and played an important role in the Paleozoic marine ecosystem.

  • Phylum: Mollusca
  • Class: Cephalopoda
  • Order: Orthocerida
  • Family: Geisonoceratidae
  • Superfamily: Orthocerataceae
  • Geological Stage: Eifelian (Middle Devonian)
  • Depositional Environment: Shallow marine shelf; fossil typically preserved in grey to black limestone indicative of low-energy sedimentation in a carbonate platform environment
  • Morphological Features: Long, slender conical shell (orthocone) with visible internal septa and a siphuncle running longitudinally through the chambers; polished specimens reveal exquisite detail of these features
  • Notable: Geisonoceras is distinguished from similar genera by the structure of its siphuncle and the spacing of septa. These orthocones are often used as biostratigraphic markers in Devonian carbonates
  • Biozone: Not specifically assigned without exact stratigraphic data
  • Identifier: Initially described and differentiated from Orthoceras by 19th-century paleontologists refining nautiloid classification

Why This Fossil Stands Out

This stunning Geisonoceras specimen has been carefully chosen and polished to enhance its natural features. It provides a detailed view of the phragmocone (chambered shell), ideal for both educational purposes and display. Sourced from one of the most prolific fossil sites in North Africa, it exemplifies the diversity and preservation quality of Devonian marine fossils.

Why Buy From Us?

  • 100% genuine fossil with Certificate of Authenticity
  • Specimen shown is the exact item you will receive
  • Sourced from trusted suppliers in Morocco
  • Perfect for collectors, educators, or as a striking natural display piece

Own a real relic of Earth’s ancient oceans — this Geisonoceras orthocone fossil from the Middle Devonian Eifelian stage of Morocco brings prehistoric marine history to life in stunning form.

Additional information

Era

Devonian
Origin

Morocco

Devonian Information

The Devonian Period (419–359 million years ago), known as the "Age of Fishes," was a time of major evolutionary advances in both marine and terrestrial life. The oceans were dominated by armored placoderm fish, early sharks, and lobe-finned fish like Tiktaalik, which had features that helped vertebrates transition to land. Coral reefs flourished, and ammonites became more diverse. On land, the first forests appeared, with early trees like Archaeopteris, leading to a drop in atmospheric carbon dioxide and climate cooling. The first tetrapods (four-legged vertebrates) began evolving from fish, marking a critical step in the evolution of amphibians. The period ended with the Devonian extinction, likely caused by ocean anoxia and climate shifts, wiping out many marine species and reshaping ecosystems.

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