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Rare 3″ Nebrodites agrigentinus Fossil Ammonite – Lower Kimmeridgian, Upper Jurassic, Madagascar – Genuine + COA

£48.00

A rare 3-inch Nebrodites agrigentinus Fossil Ammonite, from the Lower Kimmeridgian Stage of the Upper Jurassic, collected in Madagascar. This ammonite is a fine representative of the genus Nebrodites, displaying its characteristic robust shell form and ribbing, making it both a valuable collector’s specimen and a significant piece for scientific study. The exact specimen shown in the photographs is the one you will receive, and it comes with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Nebrodites agrigentinus
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Aspidoceratidae

Geological Context:

  • Period: Jurassic
  • Epoch/Stage: Upper Jurassic – Lower Kimmeridgian (approx. 157.3 to 155 million years ago)
  • Biozone: Typically associated with Platynota and early Kimmeridgian ammonite faunas used in global stratigraphy
  • Formation: Kimmeridgian marine limestone successions of Madagascar
  • Depositional Environment: Marine shelf environment with carbonate sedimentation, producing excellent preservation of ammonites

Locality:

  • Region: Madagascar

Morphology & Features:

  • Thick, robust shell with wide umbilicus
  • Coarse ribbing, ribs extending strongly over the venter
  • Evolute whorls with pronounced ornamentation
  • Diagnostic shell form typical of Nebrodites agrigentinus

Scientific Notes:

  • Nebrodites agrigentinus was first described in the 19th century as part of ammonite studies in the Kimmeridgian
  • A key taxon for understanding the diversity of Aspidoceratidae in the Upper Jurassic

Notable Details:

  • Well-preserved specimen with strong ribbing and shell features
  • Rare Madagascan ammonite with excellent display quality
  • 100% genuine, natural fossil – no restoration
  • Scale Reference: Each square or cube in the image = 1cm. Please see photos for accurate sizing

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

 

This Nebrodites agrigentinus ammonite is a rare and scientifically valuable fossil from the Lower Kimmeridgian of Madagascar – a superb addition for collectors, researchers, or natural history displays.

 

(Actual as seen)

Out of stock

SKU: UF4308 Category:

Description

A rare 3-inch Nebrodites agrigentinus Fossil Ammonite, from the Lower Kimmeridgian Stage of the Upper Jurassic, collected in Madagascar. This ammonite is a fine representative of the genus Nebrodites, displaying its characteristic robust shell form and ribbing, making it both a valuable collector’s specimen and a significant piece for scientific study. The exact specimen shown in the photographs is the one you will receive, and it comes with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Nebrodites agrigentinus
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Aspidoceratidae

Geological Context:

  • Period: Jurassic
  • Epoch/Stage: Upper Jurassic – Lower Kimmeridgian (approx. 157.3 to 155 million years ago)
  • Biozone: Typically associated with Platynota and early Kimmeridgian ammonite faunas used in global stratigraphy
  • Formation: Kimmeridgian marine limestone successions of Madagascar
  • Depositional Environment: Marine shelf environment with carbonate sedimentation, producing excellent preservation of ammonites

Locality:

  • Region: Madagascar

Morphology & Features:

  • Thick, robust shell with wide umbilicus
  • Coarse ribbing, ribs extending strongly over the venter
  • Evolute whorls with pronounced ornamentation
  • Diagnostic shell form typical of Nebrodites agrigentinus

Scientific Notes:

  • Nebrodites agrigentinus was first described in the 19th century as part of ammonite studies in the Kimmeridgian
  • A key taxon for understanding the diversity of Aspidoceratidae in the Upper Jurassic

Notable Details:

  • Well-preserved specimen with strong ribbing and shell features
  • Rare Madagascan ammonite with excellent display quality
  • 100% genuine, natural fossil – no restoration
  • Scale Reference: Each square or cube in the image = 1cm. Please see photos for accurate sizing

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

 

This Nebrodites agrigentinus ammonite is a rare and scientifically valuable fossil from the Lower Kimmeridgian of Madagascar – a superb addition for collectors, researchers, or natural history displays.

 

Additional information

Era

Jurassic

Origin

Madagascar

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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