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 Spiroceras bifurcati Heteromorph Ammonite & Cenoceras inornatum Nautilus Fossils Jurassic Dorset COA
RARE Spiroceras bifurcati Heteromorph Ammonite & Cenoceras inornatum Nautilus Fossils Jurassic Dorset COA - Image 2
RARE Spiroceras bifurcati Heteromorph Ammonite & Cenoceras inornatum Nautilus Fossils Jurassic Dorset COA - Image 3

RARE Spiroceras bifurcati Heteromorph Ammonite & Cenoceras inornatum Nautilus Fossils Jurassic Dorset COA

Original price was: £1,440.00.Current price is: £1,296.00.

A truly exceptional and rare paired fossil specimen, this multi-block features the co-preservation of a heteromorph ammonite, Spiroceras bifurcati, alongside a Jurassic nautilus, Cenoceras inornatum. It was discovered by our own team members, Alister and Alison, on 30 April 2025 at the world-renowned Jurassic Coast near Burton Bradstock, Dorset, UK.

This remarkable fossil combination comes from the Inferior Oolite Formation, a Middle Jurassic unit famous for beautifully preserved marine life.

Species Overview:

  • Spiroceras bifurcati: A rare heteromorph ammonite with a distinct open-coiling or spiral morphology, unlike the typical planispiral ammonites. Its shell features bifurcating ribs and irregular coiling, a defining characteristic of heteromorph taxa.
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Unknown/rarely classified due to unique form
  • Geological Stage: Bajocian (~170 million years ago)
  • Depositional Environment: Shallow carbonate marine shelf
  • Cenoceras inornatum: A smooth-shelled Jurassic nautiloid with a classic involute coiled form and a central siphuncle. It was likely a slow-moving predator or scavenger.
  • Order: Nautilida
  • Family: Nautilidae
  • Geological Stage: Bajocian (Middle Jurassic)
  • Depositional Environment: Shallow, warm marine waters of the oolitic platform

This fossil has been expertly cleaned, prepped, and treated by Alison, and its superb preservation highlights the distinct features of both species. The photo shows the exact specimen you will receive, and includes a 1cm scale cube for accurate sizing—please refer to the image for full details.

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity (COA), confirming their identity and provenance.

This is an extremely rare pairing, ideal for advanced collectors, museums, educational institutions, or anyone with an interest in unique and scientifically significant fossil specimens.

 

Origin: Burton Bradstock, Dorset, United Kingdom

Formation: Inferior Oolite

Age: Bajocian Stage, Middle Jurassic (~170 Ma)

Species: Spiroceras bifurcati & Cenoceras inornatum

Discovered by: Alister and Alison (30 April 2025)

Prepared by: Alison

Authenticity: 100% Genuine Fossil with COA

(Actual as seen)

Includes a fully hand-signed Premium Certificate of Authenticity.

Only 1 left in stock

SKU: CF3115 Categories: ,

Description

A truly exceptional and rare paired fossil specimen, this multi-block features the co-preservation of a heteromorph ammonite, Spiroceras bifurcati, alongside a Jurassic nautilus, Cenoceras inornatum. It was discovered by our own team members, Alister and Alison, on 30 April 2025 at the world-renowned Jurassic Coast near Burton Bradstock, Dorset, UK.

This remarkable fossil combination comes from the Inferior Oolite Formation, a Middle Jurassic unit famous for beautifully preserved marine life.

Species Overview:

  • Spiroceras bifurcati: A rare heteromorph ammonite with a distinct open-coiling or spiral morphology, unlike the typical planispiral ammonites. Its shell features bifurcating ribs and irregular coiling, a defining characteristic of heteromorph taxa.
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Unknown/rarely classified due to unique form
  • Geological Stage: Bajocian (~170 million years ago)
  • Depositional Environment: Shallow carbonate marine shelf
  • Cenoceras inornatum: A smooth-shelled Jurassic nautiloid with a classic involute coiled form and a central siphuncle. It was likely a slow-moving predator or scavenger.
  • Order: Nautilida
  • Family: Nautilidae
  • Geological Stage: Bajocian (Middle Jurassic)
  • Depositional Environment: Shallow, warm marine waters of the oolitic platform

This fossil has been expertly cleaned, prepped, and treated by Alison, and its superb preservation highlights the distinct features of both species. The photo shows the exact specimen you will receive, and includes a 1cm scale cube for accurate sizing—please refer to the image for full details.

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity (COA), confirming their identity and provenance.

This is an extremely rare pairing, ideal for advanced collectors, museums, educational institutions, or anyone with an interest in unique and scientifically significant fossil specimens.

 

Origin: Burton Bradstock, Dorset, United Kingdom

Formation: Inferior Oolite

Age: Bajocian Stage, Middle Jurassic (~170 Ma)

Species: Spiroceras bifurcati & Cenoceras inornatum

Discovered by: Alister and Alison (30 April 2025)

Prepared by: Alison

Authenticity: 100% Genuine Fossil with COA

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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