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RARE Kosmoceras spinosum Fossil Ammonite Upper Callovian Jurassic Russia Genuine

RARE Kosmoceras spinosum Fossil Ammonite Upper Callovian Jurassic Russia Genuine

£9.00

Rare Kosmoceras spinosum Fossil Ammonite

This listing offers a rare Kosmoceras spinosum fossil ammonite from the Upper Callovian stage of the Jurassic period, dating to approximately 163 – 161 million years ago. Discovered in Russia, this ammonite represents one of the most distinctive members of the family Kosmoceratidae, celebrated for its striking ornamentation and scientific importance. This particular specimen has been carefully chosen for its preservation, with all details visible in the photographs provided. The scale rule cube (1 cm) shown gives accurate size reference.

Every specimen is fully guaranteed authentic and comes with a Certificate of Authenticity, ensuring confidence for collectors, educators, and natural history enthusiasts.

Geological Context

The Upper Callovian represents a significant part of the Middle Jurassic, a period when shallow seas extended across Europe and Russia. These environments supported a wide range of marine life, from ammonites and belemnites to marine reptiles such as plesiosaurs and ichthyosaurs. The sedimentary deposits of Russia are particularly noted for preserving ammonites in remarkable condition, with fine detail and often striking shell features that allow accurate scientific classification.

Fossils like Kosmoceras spinosum serve as index fossils, enabling geologists to precisely date and correlate rock layers across different regions. The Callovian ammonite zones are among the best-studied of the Jurassic, and Kosmoceras spinosum plays an important role in this framework.

Scientific Classification

  • Genus: Kosmoceras
  • Species: Kosmoceras spinosum
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Kosmoceratidae
  • Age: Jurassic, Upper Callovian (163 – 161 million years ago)
  • Locality: Russia

Distinctive Morphology

The Kosmoceras spinosum ammonite is named for its spiny ornamentation, which sets it apart from other ammonites. Its key morphological features include:

  • Evolute shell structure, exposing earlier whorls for a wide and ornate appearance.
  • Strong ribbing and spines along the outer whorl, giving a dramatic and distinctive form.
  • Tubercles and nodules along the ribs, characteristic of the genus.
  • Complex suture lines, beautifully folded and intricate.
  • Robust and highly sculptured ornamentation, which makes specimens especially attractive to collectors.

The combination of these traits makes Kosmoceras spinosum one of the most recognisable ammonites of the Callovian.

Paleoecological Importance

Ammonites such as Kosmoceras spinosum were fast-moving cephalopods related to today’s squid and cuttlefish. Their chambered shells allowed them to control buoyancy, moving through Jurassic seas to hunt smaller marine organisms. The spines and ornamentation may have served as protection against predators, as well as reinforcing the shell in turbulent marine environments.

As widespread marine organisms with rapid evolutionary turnover, ammonites like Kosmoceras spinosum provide crucial data for the study of Jurassic ecosystems and biostratigraphy. Their presence in Russian Callovian deposits indicates a thriving marine environment with high biodiversity.

Collector’s Significance

This Kosmoceras spinosum ammonite fossil is not only a scientifically valuable specimen but also a highly aesthetic natural artifact. Its sculpted shell and distinctive ribbing make it ideal for display, and its geological age gives it a unique place in Earth’s history. Collectors prize this species both for its rarity and for its dramatic appearance, which captures the evolutionary creativity of Jurassic marine life.

As the exact fossil photographed, this specimen offers assurance of quality and authenticity. It is an exceptional addition to any fossil collection, museum display, or educational setting.

Key Details

  • Species: Kosmoceras spinosum
  • Age: Jurassic, Upper Callovian (163 – 161 million years ago)
  • Locality: Russia
  • Family: Kosmoceratidae
  • Distinct Features: Spiny ribbing, evolute shell, complex sutures
  • Certificate of Authenticity included
  • Exact specimen shown with 1 cm scale cube

This is a rare and genuine Kosmoceras spinosum ammonite fossil, a remarkable piece of natural history that brings the Jurassic seas to life.

(Actual as seen)

Only 1 left in stock

SKU: SF0954 Category:

Description

Rare Kosmoceras spinosum Fossil Ammonite

This listing offers a rare Kosmoceras spinosum fossil ammonite from the Upper Callovian stage of the Jurassic period, dating to approximately 163 – 161 million years ago. Discovered in Russia, this ammonite represents one of the most distinctive members of the family Kosmoceratidae, celebrated for its striking ornamentation and scientific importance. This particular specimen has been carefully chosen for its preservation, with all details visible in the photographs provided. The scale rule cube (1 cm) shown gives accurate size reference.

Every specimen is fully guaranteed authentic and comes with a Certificate of Authenticity, ensuring confidence for collectors, educators, and natural history enthusiasts.

Geological Context

The Upper Callovian represents a significant part of the Middle Jurassic, a period when shallow seas extended across Europe and Russia. These environments supported a wide range of marine life, from ammonites and belemnites to marine reptiles such as plesiosaurs and ichthyosaurs. The sedimentary deposits of Russia are particularly noted for preserving ammonites in remarkable condition, with fine detail and often striking shell features that allow accurate scientific classification.

Fossils like Kosmoceras spinosum serve as index fossils, enabling geologists to precisely date and correlate rock layers across different regions. The Callovian ammonite zones are among the best-studied of the Jurassic, and Kosmoceras spinosum plays an important role in this framework.

Scientific Classification

  • Genus: Kosmoceras
  • Species: Kosmoceras spinosum
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Kosmoceratidae
  • Age: Jurassic, Upper Callovian (163 – 161 million years ago)
  • Locality: Russia

Distinctive Morphology

The Kosmoceras spinosum ammonite is named for its spiny ornamentation, which sets it apart from other ammonites. Its key morphological features include:

  • Evolute shell structure, exposing earlier whorls for a wide and ornate appearance.
  • Strong ribbing and spines along the outer whorl, giving a dramatic and distinctive form.
  • Tubercles and nodules along the ribs, characteristic of the genus.
  • Complex suture lines, beautifully folded and intricate.
  • Robust and highly sculptured ornamentation, which makes specimens especially attractive to collectors.

The combination of these traits makes Kosmoceras spinosum one of the most recognisable ammonites of the Callovian.

Paleoecological Importance

Ammonites such as Kosmoceras spinosum were fast-moving cephalopods related to today’s squid and cuttlefish. Their chambered shells allowed them to control buoyancy, moving through Jurassic seas to hunt smaller marine organisms. The spines and ornamentation may have served as protection against predators, as well as reinforcing the shell in turbulent marine environments.

As widespread marine organisms with rapid evolutionary turnover, ammonites like Kosmoceras spinosum provide crucial data for the study of Jurassic ecosystems and biostratigraphy. Their presence in Russian Callovian deposits indicates a thriving marine environment with high biodiversity.

Collector’s Significance

This Kosmoceras spinosum ammonite fossil is not only a scientifically valuable specimen but also a highly aesthetic natural artifact. Its sculpted shell and distinctive ribbing make it ideal for display, and its geological age gives it a unique place in Earth’s history. Collectors prize this species both for its rarity and for its dramatic appearance, which captures the evolutionary creativity of Jurassic marine life.

As the exact fossil photographed, this specimen offers assurance of quality and authenticity. It is an exceptional addition to any fossil collection, museum display, or educational setting.

Key Details

  • Species: Kosmoceras spinosum
  • Age: Jurassic, Upper Callovian (163 – 161 million years ago)
  • Locality: Russia
  • Family: Kosmoceratidae
  • Distinct Features: Spiny ribbing, evolute shell, complex sutures
  • Certificate of Authenticity included
  • Exact specimen shown with 1 cm scale cube

This is a rare and genuine Kosmoceras spinosum ammonite fossil, a remarkable piece of natural history that brings the Jurassic seas to life.

Additional information

Era

Jurassic
Origin

Russia

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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