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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Aulacostephanus pseudomutabilis Fossil Ammonite Jurassic Kimmeridge Bay Dorset UK
Aulacostephanus pseudomutabilis Fossil Ammonite Jurassic Kimmeridge Bay Dorset UK - Image 2

Aulacostephanus pseudomutabilis Fossil Ammonite Jurassic Kimmeridge Bay Dorset UK

£28.80

A striking and rare fossil ammonite of the species Aulacostephanus pseudomutabilis, collected from the famous Upper Jurassic deposits of Kimmeridge Bay, Dorset, United Kingdom. This well-preserved cephalopod fossil hails from the Upper Kimmeridgian stage and showcases the intricate ribbing and distinctive morphology typical of the genus.

Aulacostephanus pseudomutabilis is an extinct species of ammonite belonging to the family Aulacostephanidae, within the superfamily Perisphinctoidea and the order Ammonitida. These ammonites are well known for their relatively flat, discoidal shells with strong, bifurcating ribs and an open umbilicus. They are used in biostratigraphy and are key indicators of specific zones within the Kimmeridgian.

Geological & Scientific Details:

  • Species: Aulacostephanus pseudomutabilis
  • Phylum: Mollusca
  • Class: Cephalopoda
  • Subclass: Ammonoidea
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Aulacostephanidae
  • Geological Stage: Upper Kimmeridgian
  • Period: Jurassic
  • Location: Kimmeridge Bay, Dorset, United Kingdom
  • Depositional Environment: Shallow marine, low-energy basin margin
  • Morphology Features: Strong bifurcating ribbing, discoidal shell, open umbilicus, planispiral coiling

Why This Specimen Stands Out:

  • Classic locality from the world-renowned Jurassic Coast
  • Distinctive morphological features ideal for collectors
  • Excellent preservation of diagnostic traits
  • Carefully selected specimen shown in photographs
  • Supplied with Certificate of Authenticity

Scale Reference: Scale Rule Squares / Cube = 1cm – Please refer to the photo for full sizing. The image shows the actual specimen you will receive.

Shipping & Packaging:

  • Secure, professional packaging
  • Tracked shipping available worldwide

An excellent addition to any fossil collection, this ammonite represents both natural beauty and palaeontological value.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

(Actual as seen)

Only 1 left in stock

SKU: UF3532 Category:

Description

A striking and rare fossil ammonite of the species Aulacostephanus pseudomutabilis, collected from the famous Upper Jurassic deposits of Kimmeridge Bay, Dorset, United Kingdom. This well-preserved cephalopod fossil hails from the Upper Kimmeridgian stage and showcases the intricate ribbing and distinctive morphology typical of the genus.

Aulacostephanus pseudomutabilis is an extinct species of ammonite belonging to the family Aulacostephanidae, within the superfamily Perisphinctoidea and the order Ammonitida. These ammonites are well known for their relatively flat, discoidal shells with strong, bifurcating ribs and an open umbilicus. They are used in biostratigraphy and are key indicators of specific zones within the Kimmeridgian.

Geological & Scientific Details:

  • Species: Aulacostephanus pseudomutabilis
  • Phylum: Mollusca
  • Class: Cephalopoda
  • Subclass: Ammonoidea
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Aulacostephanidae
  • Geological Stage: Upper Kimmeridgian
  • Period: Jurassic
  • Location: Kimmeridge Bay, Dorset, United Kingdom
  • Depositional Environment: Shallow marine, low-energy basin margin
  • Morphology Features: Strong bifurcating ribbing, discoidal shell, open umbilicus, planispiral coiling

Why This Specimen Stands Out:

  • Classic locality from the world-renowned Jurassic Coast
  • Distinctive morphological features ideal for collectors
  • Excellent preservation of diagnostic traits
  • Carefully selected specimen shown in photographs
  • Supplied with Certificate of Authenticity

Scale Reference: Scale Rule Squares / Cube = 1cm – Please refer to the photo for full sizing. The image shows the actual specimen you will receive.

Shipping & Packaging:

  • Secure, professional packaging
  • Tracked shipping available worldwide

An excellent addition to any fossil collection, this ammonite represents both natural beauty and palaeontological value.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

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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