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Rare Gleviceras abaloensis Ammonite Fossil Genuine Jurassic Upper Pliensbachian St Peters Field Radstock UK with Certificate of Authenticity

Rare Gleviceras abaloensis Ammonite Fossil Genuine Jurassic Upper Pliensbachian St Peters Field Radstock UK with Certificate of Authenticity

£18.00

100% Genuine Rare Gleviceras abaloensis Ammonite Fossil

This listing is for a rare Gleviceras abaloensis ammonite fossil from the Upper Pliensbachian stage of the Jurassic period, collected at St Peters Field, Radstock, United Kingdom. The specimen pictured is the exact one you will receive, shown with a 1cm scale cube for accurate sizing. Every fossil offered is 100% genuine and supplied with a Certificate of Authenticity for complete peace of mind.

Geological Background – Upper Pliensbachian, Jurassic

The specimen dates back to the Upper Pliensbachian stage of the Early Jurassic, around 185 million years ago. At this time, southern Britain was part of a shallow marine environment where epicontinental seas stretched across much of Europe. These conditions created ideal settings for ammonites to thrive and for their remains to be preserved within the fine mudstones and limestones of the Lower Lias sequence.

The St Peters Field site in Radstock, Somerset, is a key fossil locality renowned for producing ammonites from the Spinatum Zone of the Upper Pliensbachian. Fossils from this site are scientifically important because they are linked to precise ammonite biozones, which paleontologists use to correlate Jurassic rocks across Europe. Rare species such as Gleviceras abaloensis are particularly prized finds.

Fossil Type and Species – Gleviceras abaloensis

Gleviceras abaloensis belongs to the order Ammonitida, superfamily Hildoceratoidea, and family Hildoceratidae. Ammonites of this genus are characterised by their compressed, discoidal shells, fine ribbing, and distinctive keeled venters. Gleviceras is a significant genus within Jurassic paleontology due to its restricted stratigraphic range, making it valuable as an index fossil.

As nektonic carnivores, ammonites like Gleviceras were active swimmers that hunted smaller marine organisms. Their buoyancy was regulated through their chambered shells, which also contributed to their elegant and hydrodynamic form.

Morphology and Distinguishing Features

The shell of Gleviceras abaloensis is discoidal, compressed, and evolute to subinvolute in coiling, leaving earlier whorls partly visible. Its ribbing is fine and consistent, extending cleanly across the flanks and toward the sharp ventrolateral margins. The venter is narrow and keeled, indicating adaptations for swift movement in open marine waters.

The sutures of this species are intricate and deeply folded, typical of Hildoceratidae. These features, combined with the finely ribbed shell and keeled venter, distinguish Gleviceras abaloensis from other ammonites of the Spinatum Zone. Well-preserved examples such as this one are rare, adding both scientific and aesthetic value to the specimen.

Biozone and Scientific Importance

Gleviceras abaloensis is associated with the Spinatum Zone of the Upper Pliensbachian, one of the key ammonite biozones used to date and correlate Early Jurassic strata across Europe. As a rare and stratigraphically restricted species, it serves as an important index fossil, aiding geologists in refining the Jurassic timescale.

Its rarity in UK deposits, combined with its clear diagnostic features, makes it particularly desirable for both collectors and researchers. Fossils of Gleviceras abaloensis provide insights into ammonite diversity, paleoecology, and evolutionary adaptations during this dynamic period of Earth’s history.

Collectors and Enthusiasts

For collectors, a Gleviceras abaloensis ammonite fossil represents an exceptional addition to any collection of Jurassic material. Its rarity, elegant ribbing, and association with the Spinatum Zone make it especially valuable. Specimens from St Peters Field carry strong provenance, ensuring both scientific and historical significance.

Why This Specimen is Unique

  • Rare Gleviceras abaloensis ammonite fossil
  • From the Upper Pliensbachian, Spinatum Zone (~185 million years old)
  • Collected at St Peters Field, Radstock, Somerset, United Kingdom
  • Belongs to the family Hildoceratidae, order Ammonitida
  • Supplied with a Certificate of Authenticity
  • Exact specimen shown in the photos will be sent
  • Includes 1cm cube for scale reference

This rare Gleviceras abaloensis ammonite fossil is an outstanding specimen from the Upper Pliensbachian of Radstock. With its compressed, keeled shell and fine ribbing, it is both scientifically significant and visually striking, making it a superb addition to any fossil collection.

 

(Actual as seen)

Only 1 left in stock

SKU: UF5900 Category:

Description

100% Genuine Rare Gleviceras abaloensis Ammonite Fossil

This listing is for a rare Gleviceras abaloensis ammonite fossil from the Upper Pliensbachian stage of the Jurassic period, collected at St Peters Field, Radstock, United Kingdom. The specimen pictured is the exact one you will receive, shown with a 1cm scale cube for accurate sizing. Every fossil offered is 100% genuine and supplied with a Certificate of Authenticity for complete peace of mind.

Geological Background – Upper Pliensbachian, Jurassic

The specimen dates back to the Upper Pliensbachian stage of the Early Jurassic, around 185 million years ago. At this time, southern Britain was part of a shallow marine environment where epicontinental seas stretched across much of Europe. These conditions created ideal settings for ammonites to thrive and for their remains to be preserved within the fine mudstones and limestones of the Lower Lias sequence.

The St Peters Field site in Radstock, Somerset, is a key fossil locality renowned for producing ammonites from the Spinatum Zone of the Upper Pliensbachian. Fossils from this site are scientifically important because they are linked to precise ammonite biozones, which paleontologists use to correlate Jurassic rocks across Europe. Rare species such as Gleviceras abaloensis are particularly prized finds.

Fossil Type and Species – Gleviceras abaloensis

Gleviceras abaloensis belongs to the order Ammonitida, superfamily Hildoceratoidea, and family Hildoceratidae. Ammonites of this genus are characterised by their compressed, discoidal shells, fine ribbing, and distinctive keeled venters. Gleviceras is a significant genus within Jurassic paleontology due to its restricted stratigraphic range, making it valuable as an index fossil.

As nektonic carnivores, ammonites like Gleviceras were active swimmers that hunted smaller marine organisms. Their buoyancy was regulated through their chambered shells, which also contributed to their elegant and hydrodynamic form.

Morphology and Distinguishing Features

The shell of Gleviceras abaloensis is discoidal, compressed, and evolute to subinvolute in coiling, leaving earlier whorls partly visible. Its ribbing is fine and consistent, extending cleanly across the flanks and toward the sharp ventrolateral margins. The venter is narrow and keeled, indicating adaptations for swift movement in open marine waters.

The sutures of this species are intricate and deeply folded, typical of Hildoceratidae. These features, combined with the finely ribbed shell and keeled venter, distinguish Gleviceras abaloensis from other ammonites of the Spinatum Zone. Well-preserved examples such as this one are rare, adding both scientific and aesthetic value to the specimen.

Biozone and Scientific Importance

Gleviceras abaloensis is associated with the Spinatum Zone of the Upper Pliensbachian, one of the key ammonite biozones used to date and correlate Early Jurassic strata across Europe. As a rare and stratigraphically restricted species, it serves as an important index fossil, aiding geologists in refining the Jurassic timescale.

Its rarity in UK deposits, combined with its clear diagnostic features, makes it particularly desirable for both collectors and researchers. Fossils of Gleviceras abaloensis provide insights into ammonite diversity, paleoecology, and evolutionary adaptations during this dynamic period of Earth’s history.

Collectors and Enthusiasts

For collectors, a Gleviceras abaloensis ammonite fossil represents an exceptional addition to any collection of Jurassic material. Its rarity, elegant ribbing, and association with the Spinatum Zone make it especially valuable. Specimens from St Peters Field carry strong provenance, ensuring both scientific and historical significance.

Why This Specimen is Unique

  • Rare Gleviceras abaloensis ammonite fossil
  • From the Upper Pliensbachian, Spinatum Zone (~185 million years old)
  • Collected at St Peters Field, Radstock, Somerset, United Kingdom
  • Belongs to the family Hildoceratidae, order Ammonitida
  • Supplied with a Certificate of Authenticity
  • Exact specimen shown in the photos will be sent
  • Includes 1cm cube for scale reference

This rare Gleviceras abaloensis ammonite fossil is an outstanding specimen from the Upper Pliensbachian of Radstock. With its compressed, keeled shell and fine ribbing, it is both scientifically significant and visually striking, making it a superb addition to any fossil collection.

 

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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