Fossils for Sale - High-quality BRITISH and WORLDWIDE Fossils. An impressive selection of fossils, including Ammonites, Trilobites, Belemnites, Fossil Fish, Fossil Shark Teeth, Fossilised Insects in Amber, Dinosaurs, and Reptiles. UK Fossils was formed in 1988 and collects and preps our own fossils in the heart of the Jurassic Coast, collecting fossils from Lyme Regis, Charmouth and Somerset. Our passion for fossils is reflected in our carefully curated collection, which includes some of the rarest and most unique specimens available.

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Rare: Fossil Ammonites – Geyerina fasciata | Aalenian | Jurassic | Port Mulgrave UK | Genuine + Certificate of Authenticity
Rare: Fossil Ammonites – Geyerina fasciata | Aalenian | Jurassic | Port Mulgrave UK | Genuine + Certificate of Authenticity - Image 2

Rare: Fossil Ammonites – Geyerina fasciata | Aalenian | Jurassic | Port Mulgrave UK | Genuine + Certificate of Authenticity

Original price was: £24.00.Current price is: £21.60.

This listing is for a rare and genuine Geyerina fasciata fossil ammonite from the Aalenian Stage of the Middle Jurassic, collected at Port Mulgrave, Yorkshire, United Kingdom. Dating back approximately 174 to 170 million years, this remarkable ammonite is a scientifically and aesthetically prized specimen from one of Britain’s most famous fossil localities.

Scale Rule Squares / Cube = 1cm

Please refer to the photos for exact sizing. You will receive the exact specimen shown.

All of our Fossils are 100% Genuine Specimens and come with a Certificate of Authenticity.

🧬 Fossil & Geological Details:

  • Fossil Type: Ammonite
  • Genus: Geyerina
  • Species: Geyerina fasciata
  • Order: Ammonitida
  • Superfamily: Hammatoceratoidea
  • Family: Hammatoceratidae
  • Geological Period: Jurassic
  • Geological Stage: Aalenian (Middle Jurassic)
  • Age: ~174 to 170 million years ago
  • Location: Port Mulgrave, North Yorkshire, UK
  • Formation: Possibly part of the Lower Oolite or Whitby Mudstone succession (depending on exact bed)
  • Depositional Environment: Marine, offshore shelf—likely low-energy, muddy sea floor conditions

🌀 Morphology & Features:

Geyerina fasciata is identifiable by:

  • Strongly ribbed, involute shell
  • Deep constrictions between ribs
  • Pronounced keels, often with tubercles or nodes
  • Compressed whorl section
  • Ribbing often becomes more fasciculate (bundled) toward the venter, giving the species its name
  • Excellent for study in ammonite evolutionary development across Aalenian biozones

Its distinctive morphology makes it a useful zonal indicator for the Aalenian and helps in biostratigraphic correlation across northwest Europe.

🔬 Scientific & Collector Importance:

Geyerina fasciata was originally described in the 19th century and remains a key taxon for understanding ammonite faunal turnover during the Aalenian. Specimens from Port Mulgrave are often well-preserved and are of interest to:

  • Ammonite collectors
  • Stratigraphers
  • Palaeontology educators
  • Museums & research institutions

You Will Receive:

  • The exact Geyerina fasciata fossil shown in the listing photos
  • Certificate of Authenticity
  • Protective packaging for safe delivery
  • Tracked UK/international shipping available

Add this beautifully preserved, scientifically important ammonite to your collection—perfect for collectors, educators, and palaeontology enthusiasts alike.

(Actual as seen)

Only 1 left in stock

SKU: UF4560 Category:

Description

This listing is for a rare and genuine Geyerina fasciata fossil ammonite from the Aalenian Stage of the Middle Jurassic, collected at Port Mulgrave, Yorkshire, United Kingdom. Dating back approximately 174 to 170 million years, this remarkable ammonite is a scientifically and aesthetically prized specimen from one of Britain’s most famous fossil localities.

Scale Rule Squares / Cube = 1cm

Please refer to the photos for exact sizing. You will receive the exact specimen shown.

All of our Fossils are 100% Genuine Specimens and come with a Certificate of Authenticity.

🧬 Fossil & Geological Details:

  • Fossil Type: Ammonite
  • Genus: Geyerina
  • Species: Geyerina fasciata
  • Order: Ammonitida
  • Superfamily: Hammatoceratoidea
  • Family: Hammatoceratidae
  • Geological Period: Jurassic
  • Geological Stage: Aalenian (Middle Jurassic)
  • Age: ~174 to 170 million years ago
  • Location: Port Mulgrave, North Yorkshire, UK
  • Formation: Possibly part of the Lower Oolite or Whitby Mudstone succession (depending on exact bed)
  • Depositional Environment: Marine, offshore shelf—likely low-energy, muddy sea floor conditions

🌀 Morphology & Features:

Geyerina fasciata is identifiable by:

  • Strongly ribbed, involute shell
  • Deep constrictions between ribs
  • Pronounced keels, often with tubercles or nodes
  • Compressed whorl section
  • Ribbing often becomes more fasciculate (bundled) toward the venter, giving the species its name
  • Excellent for study in ammonite evolutionary development across Aalenian biozones

Its distinctive morphology makes it a useful zonal indicator for the Aalenian and helps in biostratigraphic correlation across northwest Europe.

🔬 Scientific & Collector Importance:

Geyerina fasciata was originally described in the 19th century and remains a key taxon for understanding ammonite faunal turnover during the Aalenian. Specimens from Port Mulgrave are often well-preserved and are of interest to:

  • Ammonite collectors
  • Stratigraphers
  • Palaeontology educators
  • Museums & research institutions

You Will Receive:

  • The exact Geyerina fasciata fossil shown in the listing photos
  • Certificate of Authenticity
  • Protective packaging for safe delivery
  • Tracked UK/international shipping available

Add this beautifully preserved, scientifically important ammonite to your collection—perfect for collectors, educators, and palaeontology enthusiasts alike.

Additional information

Era

Jurassic
Origin

United Kingdom

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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