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%

Rare 7" Coroniceras rotiforme Fossil Ammonite, Lower Jurassic, Sinemurian, Bucklandi Zone, Keynsham UK, Genuine COA
Rare 7" Coroniceras rotiforme Fossil Ammonite, Lower Jurassic, Sinemurian, Bucklandi Zone, Keynsham UK, Genuine COA - Image 2

Rare 7″ Coroniceras rotiforme Fossil Ammonite, Lower Jurassic, Sinemurian, Bucklandi Zone, Keynsham UK, Genuine COA

£432.00

Available for purchase is a Rare 7″ Fossil Ammonite of Coroniceras rotiforme from the Lower Sinemurian Stage of the Lower Jurassic, found in Keynsham, Bristol, Somerset, United Kingdom — a classic and historically significant fossil location in the UK.

Scale Rule Squares / Cube = 1cm — please refer to the photograph for full sizing. The fossil shown is the actual specimen you will receive, professionally selected for its scientific integrity and aesthetic quality.

Key Geological and Scientific Details:

  • Species: Coroniceras rotiforme
  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Geological Period: Jurassic
  • Stage: Lower Sinemurian (Early Jurassic)
  • Biozone: Arietes Ammonite Zone, specifically within the Bucklandi Subzone
  • Location: Keynsham, Bristol, Somerset, England, UK
  • Approximate Age: ~199 million years
  • Stratigraphy: Lower Lias Formation (Blue Lias Group)
  • Order: Ammonitida
  • Superfamily: Psiloceratoidea
  • Family: Arietitidae
  • Described By: Originally described under various synonyms; final taxonomy attributed to 19th-century palaeontologists refining the genus Coroniceras

Morphology Features:

Coroniceras rotiforme is known for its planispiral, evolute shell with compressed whorls and a strongly ridged and ribbed ornamentation that often terminates in tubercles or spines along the venter. The suture lines are moderately complex, and the shell surface typically shows robust primary ribs and fine secondary ones. This specimen displays remarkable preservation, making it ideal for both collectors and educational display.

Depositional Environment:

This ammonite comes from the Lower Lias Formation, a classic marine sedimentary unit comprising limestone and shale layers. The environment of deposition was a shallow epicontinental sea, low in energy, conducive to the exceptional fossilisation of marine fauna — especially ammonites, bivalves, and marine reptiles.

Notable Context:

The Coroniceras genus is well-represented in Lower Jurassic ammonite faunas, with rotiforme being one of the larger and more visually impressive species. Its occurrence in the Bucklandi Zone helps refine the stratigraphic framework used across Britain and Europe, especially for correlating marine deposits.

Authenticity Guarantee:

All of our fossils are 100% genuine specimens, responsibly sourced and professionally handled. Every fossil comes with a Certificate of Authenticity, ensuring scientific integrity and buyer confidence.

This Coroniceras rotiforme fossil is a highly desirable collector’s item — scientifically valuable, visually impressive, and steeped in palaeontological significance. Perfect for fossil enthusiasts, educational settings, or as a standout natural history display.

(Actual as seen)

Includes a fully hand-signed Premium Certificate of Authenticity.

Only 1 left in stock

SKU: UF4438 Category:

Description

Available for purchase is a Rare 7″ Fossil Ammonite of Coroniceras rotiforme from the Lower Sinemurian Stage of the Lower Jurassic, found in Keynsham, Bristol, Somerset, United Kingdom — a classic and historically significant fossil location in the UK.

Scale Rule Squares / Cube = 1cm — please refer to the photograph for full sizing. The fossil shown is the actual specimen you will receive, professionally selected for its scientific integrity and aesthetic quality.

Key Geological and Scientific Details:

  • Species: Coroniceras rotiforme
  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Geological Period: Jurassic
  • Stage: Lower Sinemurian (Early Jurassic)
  • Biozone: Arietes Ammonite Zone, specifically within the Bucklandi Subzone
  • Location: Keynsham, Bristol, Somerset, England, UK
  • Approximate Age: ~199 million years
  • Stratigraphy: Lower Lias Formation (Blue Lias Group)
  • Order: Ammonitida
  • Superfamily: Psiloceratoidea
  • Family: Arietitidae
  • Described By: Originally described under various synonyms; final taxonomy attributed to 19th-century palaeontologists refining the genus Coroniceras

Morphology Features:

Coroniceras rotiforme is known for its planispiral, evolute shell with compressed whorls and a strongly ridged and ribbed ornamentation that often terminates in tubercles or spines along the venter. The suture lines are moderately complex, and the shell surface typically shows robust primary ribs and fine secondary ones. This specimen displays remarkable preservation, making it ideal for both collectors and educational display.

Depositional Environment:

This ammonite comes from the Lower Lias Formation, a classic marine sedimentary unit comprising limestone and shale layers. The environment of deposition was a shallow epicontinental sea, low in energy, conducive to the exceptional fossilisation of marine fauna — especially ammonites, bivalves, and marine reptiles.

Notable Context:

The Coroniceras genus is well-represented in Lower Jurassic ammonite faunas, with rotiforme being one of the larger and more visually impressive species. Its occurrence in the Bucklandi Zone helps refine the stratigraphic framework used across Britain and Europe, especially for correlating marine deposits.

Authenticity Guarantee:

All of our fossils are 100% genuine specimens, responsibly sourced and professionally handled. Every fossil comes with a Certificate of Authenticity, ensuring scientific integrity and buyer confidence.

This Coroniceras rotiforme fossil is a highly desirable collector’s item — scientifically valuable, visually impressive, and steeped in palaeontological significance. Perfect for fossil enthusiasts, educational settings, or as a standout natural history display.

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