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.

FREE UK DELIVERY - Save up to 60%

Euagassiceras resupinatum Ammonite Fossil Rare Sinemurian Jurassic Hoplderness UK COA

Euagassiceras resupinatum Ammonite Fossil Rare Sinemurian Jurassic Hoplderness UK COA

£9.00

Rare Euagassiceras resupinatum Ammonite Fossil from Hoplderness, United Kingdom

Offered here is a rare Euagassiceras resupinatum ammonite fossil, an exceptional example from the Sinemurian stage of the Early Jurassic period, discovered in Hoplderness, United Kingdom. Dating back approximately 199–190 million years, this ammonite represents a remarkable piece of Britain’s deep geological history and an iconic fossil from the Lower Jurassic seas.

The fossil displayed is the exact specimen you will receive, photographed with a 1 cm scale cube for accurate measurement reference. As with all our fossils, this specimen is 100% genuine and will be supplied with a Certificate of Authenticity.

Geological Context – Sinemurian Stage, Early Jurassic

The Sinemurian stage is a critical subdivision of the Early Jurassic, spanning roughly 199 to 190 million years ago. During this period, much of northern Europe, including what is now Britain, was submerged under shallow epicontinental seas. These warm marine environments supported a flourishing ammonite fauna, which today provides paleontologists with highly reliable biostratigraphic markers for correlating rock sequences.

The coastal deposits of Hoplderness, like other parts of Yorkshire, are noted for their fine preservation of marine fossils, including ammonites, belemnites, bivalves, and occasional marine reptiles. This geological heritage has made the region one of the world’s most studied Early Jurassic fossil localities.

Scientific Classification

  • Genus: Euagassiceras
  • Species: Euagassiceras resupinatum
  • Family: Oxynoticeratidae
  • Superfamily: Psiloceratoidea
  • Order: Ammonitida
  • Geological Stage: Sinemurian, Early Jurassic (c. 199–190 million years ago)
  • Locality: Hoplderness, United Kingdom

Morphological Features of Euagassiceras resupinatum

The ammonite Euagassiceras resupinatum is characterised by several distinctive morphological traits:

  • Compressed, evolute shell form, with whorls that are well exposed.
  • Fine ribbing pattern, radiating evenly from the umbilicus to the venter, creating an elegant and symmetrical shell.
  • A relatively narrow venter, with ribs continuing smoothly across the outer edge.
  • Intricate suture lines, reflecting the complex chamber divisions that allowed for buoyancy control.

These features not only allow paleontologists to identify the species but also highlight the natural aesthetic qualities that make ammonites so appealing to collectors.

Stratigraphic and Scientific Importance

Ammonites such as Euagassiceras resupinatum are of great biostratigraphic importance. Their restricted time range in the Sinemurian makes them valuable index fossils, allowing geologists to accurately date and correlate rock formations across Europe and beyond.

The Oxynoticeratidae family, to which Euagassiceras belongs, is particularly significant in the Lower Jurassic fossil record, helping define biozones that are still used in stratigraphy today. Fossils like this provide a direct connection to the evolution and diversification of ammonites in the aftermath of the Triassic–Jurassic extinction event.

Paleoecology and Ancient Environment

Euagassiceras ammonites were free-swimming, nektonic cephalopods inhabiting the shallow marine seas of the Early Jurassic. They used their chambered shells to regulate buoyancy and were likely active predators or opportunistic feeders, preying on small crustaceans, molluscs, and planktonic organisms.

They shared their marine ecosystem with a diverse range of organisms, including belemnites, fish, crinoids, brachiopods, and larger marine reptiles such as ichthyosaurs and plesiosaurs. This fossil, therefore, represents not only an individual species but also a snapshot of the dynamic marine ecosystems of the Early Jurassic seas.

Collector and Display Value

This Euagassiceras resupinatum ammonite fossil from Hoplderness is a highly desirable specimen due to its rarity, fine preservation, and provenance from one of Britain’s most celebrated fossil localities. Its combination of scientific importance, aesthetic appeal, and authentic historical value makes it suitable for advanced collectors, educational use, and striking display in any natural history collection.

Key Details

  • Fossil Type: Ammonite
  • Species: Euagassiceras resupinatum
  • Age: Sinemurian Stage, Early Jurassic (c. 199–190 million years old)
  • Locality: Hoplderness, United Kingdom
  • Distinctive compressed and ribbed morphology
  • Supplied with a Certificate of Authenticity
  • Exact specimen shown in photos with 1 cm scale cube

This is a unique opportunity to acquire a genuine Sinemurian ammonite fossil, linking you directly to the rich marine life of the Early Jurassic seas of Britain.

(Actual as seen)

Only 1 left in stock

SKU: SF0993 Category:

Description

Rare Euagassiceras resupinatum Ammonite Fossil from Hoplderness, United Kingdom

Offered here is a rare Euagassiceras resupinatum ammonite fossil, an exceptional example from the Sinemurian stage of the Early Jurassic period, discovered in Hoplderness, United Kingdom. Dating back approximately 199–190 million years, this ammonite represents a remarkable piece of Britain’s deep geological history and an iconic fossil from the Lower Jurassic seas.

The fossil displayed is the exact specimen you will receive, photographed with a 1 cm scale cube for accurate measurement reference. As with all our fossils, this specimen is 100% genuine and will be supplied with a Certificate of Authenticity.

Geological Context – Sinemurian Stage, Early Jurassic

The Sinemurian stage is a critical subdivision of the Early Jurassic, spanning roughly 199 to 190 million years ago. During this period, much of northern Europe, including what is now Britain, was submerged under shallow epicontinental seas. These warm marine environments supported a flourishing ammonite fauna, which today provides paleontologists with highly reliable biostratigraphic markers for correlating rock sequences.

The coastal deposits of Hoplderness, like other parts of Yorkshire, are noted for their fine preservation of marine fossils, including ammonites, belemnites, bivalves, and occasional marine reptiles. This geological heritage has made the region one of the world’s most studied Early Jurassic fossil localities.

Scientific Classification

  • Genus: Euagassiceras
  • Species: Euagassiceras resupinatum
  • Family: Oxynoticeratidae
  • Superfamily: Psiloceratoidea
  • Order: Ammonitida
  • Geological Stage: Sinemurian, Early Jurassic (c. 199–190 million years ago)
  • Locality: Hoplderness, United Kingdom

Morphological Features of Euagassiceras resupinatum

The ammonite Euagassiceras resupinatum is characterised by several distinctive morphological traits:

  • Compressed, evolute shell form, with whorls that are well exposed.
  • Fine ribbing pattern, radiating evenly from the umbilicus to the venter, creating an elegant and symmetrical shell.
  • A relatively narrow venter, with ribs continuing smoothly across the outer edge.
  • Intricate suture lines, reflecting the complex chamber divisions that allowed for buoyancy control.

These features not only allow paleontologists to identify the species but also highlight the natural aesthetic qualities that make ammonites so appealing to collectors.

Stratigraphic and Scientific Importance

Ammonites such as Euagassiceras resupinatum are of great biostratigraphic importance. Their restricted time range in the Sinemurian makes them valuable index fossils, allowing geologists to accurately date and correlate rock formations across Europe and beyond.

The Oxynoticeratidae family, to which Euagassiceras belongs, is particularly significant in the Lower Jurassic fossil record, helping define biozones that are still used in stratigraphy today. Fossils like this provide a direct connection to the evolution and diversification of ammonites in the aftermath of the Triassic–Jurassic extinction event.

Paleoecology and Ancient Environment

Euagassiceras ammonites were free-swimming, nektonic cephalopods inhabiting the shallow marine seas of the Early Jurassic. They used their chambered shells to regulate buoyancy and were likely active predators or opportunistic feeders, preying on small crustaceans, molluscs, and planktonic organisms.

They shared their marine ecosystem with a diverse range of organisms, including belemnites, fish, crinoids, brachiopods, and larger marine reptiles such as ichthyosaurs and plesiosaurs. This fossil, therefore, represents not only an individual species but also a snapshot of the dynamic marine ecosystems of the Early Jurassic seas.

Collector and Display Value

This Euagassiceras resupinatum ammonite fossil from Hoplderness is a highly desirable specimen due to its rarity, fine preservation, and provenance from one of Britain’s most celebrated fossil localities. Its combination of scientific importance, aesthetic appeal, and authentic historical value makes it suitable for advanced collectors, educational use, and striking display in any natural history collection.

Key Details

  • Fossil Type: Ammonite
  • Species: Euagassiceras resupinatum
  • Age: Sinemurian Stage, Early Jurassic (c. 199–190 million years old)
  • Locality: Hoplderness, United Kingdom
  • Distinctive compressed and ribbed morphology
  • Supplied with a Certificate of Authenticity
  • Exact specimen shown in photos with 1 cm scale cube

This is a unique opportunity to acquire a genuine Sinemurian ammonite fossil, linking you directly to the rich marine life of the Early Jurassic seas of Britain.

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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Related products