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 8" Amaltheus margaritatus Fossil Ammonite, Beacon Limestone Jurassic, Ilminster Somerset UK
RARE 8" Amaltheus margaritatus Fossil Ammonite, Beacon Limestone Jurassic, Ilminster Somerset UK - Image 2

RARE 8″ Amaltheus margaritatus Fossil Ammonite, Beacon Limestone Jurassic, Ilminster Somerset UK

Original price was: £36.00.Current price is: £32.40.

Offering an extraordinary and rare 8″ Amaltheus margaritatus fossil ammonite, collected from the renowned Beacon Limestone Formation of the Early Jurassic Period, this specimen was found in Ilminster, Somerset, United Kingdom.

This impressive specimen represents Amaltheus margaritatus, a species of ammonite highly prized for its elegant ribbing and distinctive shell features. Formally described by Montfort in 1808, it is a significant index fossil in European biostratigraphy.

Taxonomic Classification:

  • Order: Ammonitida
  • Superfamily: Eoderoceratoidea
  • Family: Amaltheidae

Morphological Features:

  • Moderately involute shell with a narrow umbilicus
  • Finely ribbed shell, with ribs that curve gently across the flanks
  • Delicate shell ornamentation, typical of the species
  • Often displays subtle keel or venter in well-preserved examples

Geological Context:

  • Formation: Beacon Limestone
  • Stage: Upper Pliensbachian (part of the Lower Jurassic)
  • Biozone: Amaltheus margaritatus Zone
  • Age: Approximately 190 million years old
  • Depositional Environment: Shallow epicontinental marine shelf in a warm, low-latitude Jurassic sea. The sedimentary environment of the Beacon Limestone is known for fine-grained limestones and mudstones ideal for fossil preservation.

Notable Details:

  • This species is a key biostratigraphic marker in the British and NW European Jurassic stratigraphy.
  • Fossils from Ilminster are particularly valued due to the exceptional quality of preservation seen in the Beacon Limestone.

This authentic fossil is shown in the listing with a 1cm scale cube for size reference. You will receive the exact specimen pictured, a carefully selected fossil chosen for both scientific significance and visual appeal.

Authenticity Guaranteed: All our fossils are 100% genuine specimens, and each includes a Certificate of Authenticity. This is a museum-grade piece, ideal for collectors, educators, and as a centrepiece in any fossil collection.

Please refer to the photos for precise dimensions and condition. Don’t miss the chance to own this stunning ammonite from one of the UK’s most important Jurassic fossil localities.

(Actual as seen)

Only 1 left in stock

SKU: UF3856 Category:

Description

Offering an extraordinary and rare 8″ Amaltheus margaritatus fossil ammonite, collected from the renowned Beacon Limestone Formation of the Early Jurassic Period, this specimen was found in Ilminster, Somerset, United Kingdom.

This impressive specimen represents Amaltheus margaritatus, a species of ammonite highly prized for its elegant ribbing and distinctive shell features. Formally described by Montfort in 1808, it is a significant index fossil in European biostratigraphy.

Taxonomic Classification:

  • Order: Ammonitida
  • Superfamily: Eoderoceratoidea
  • Family: Amaltheidae

Morphological Features:

  • Moderately involute shell with a narrow umbilicus
  • Finely ribbed shell, with ribs that curve gently across the flanks
  • Delicate shell ornamentation, typical of the species
  • Often displays subtle keel or venter in well-preserved examples

Geological Context:

  • Formation: Beacon Limestone
  • Stage: Upper Pliensbachian (part of the Lower Jurassic)
  • Biozone: Amaltheus margaritatus Zone
  • Age: Approximately 190 million years old
  • Depositional Environment: Shallow epicontinental marine shelf in a warm, low-latitude Jurassic sea. The sedimentary environment of the Beacon Limestone is known for fine-grained limestones and mudstones ideal for fossil preservation.

Notable Details:

  • This species is a key biostratigraphic marker in the British and NW European Jurassic stratigraphy.
  • Fossils from Ilminster are particularly valued due to the exceptional quality of preservation seen in the Beacon Limestone.

This authentic fossil is shown in the listing with a 1cm scale cube for size reference. You will receive the exact specimen pictured, a carefully selected fossil chosen for both scientific significance and visual appeal.

Authenticity Guaranteed: All our fossils are 100% genuine specimens, and each includes a Certificate of Authenticity. This is a museum-grade piece, ideal for collectors, educators, and as a centrepiece in any fossil collection.

Please refer to the photos for precise dimensions and condition. Don’t miss the chance to own this stunning ammonite from one of the UK’s most important Jurassic fossil localities.

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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