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 Fossil Ammonite Aptychi – Jurassic Oxford Clay Mouth Parts – Peterborough UK – Genuine Fossil Specimen
RARE Fossil Ammonite Aptychi – Jurassic Oxford Clay Mouth Parts – Peterborough UK – Genuine Fossil Specimen - Image 2

RARE Fossil Ammonite Aptychi – Jurassic Oxford Clay Mouth Parts – Peterborough UK – Genuine Fossil Specimen

Original price was: £64.80.Current price is: £58.32.

RARE Fossil Ammonite Aptychi (Mouth Parts) – Oxford Clay Formation – Middle Jurassic – Peterborough, United Kingdom

This listing features an exceptionally rare pair of fossil ammonite aptychi, also referred to as jaw plates or opercula. These structures are often misidentified or overlooked but are now widely accepted as the calcified lower jaws or protective opercula of ammonites. This specimen was found in the famous Oxford Clay Formation near Peterborough, UK, a globally important site for marine Jurassic fossils.

Fossil Type: Aptychi (Mouthparts of Ammonites)

Likely Species: Indeterminate ammonite – possibly Kosmoceras or related genera (commonly found in the Oxford Clay)

Order: Ammonitida

Superfamily: Stephanoceratoidea

Geological Stage: Middle Jurassic – Callovian (~164 million years ago)

Formation: Oxford Clay Formation

Location: Peterborough, Cambridgeshire, United Kingdom

Depositional Environment: Deep marine basin – fine clay-rich sediments with low oxygen, favouring excellent fossil preservation

Biozone/Zone: Common zones in the region include the Kosmoceras jason and Sigaloceras calloviense zones (approximate)

Morphology Features: Aptychi are typically found as a symmetrical pair of small, flat, curved plates made of calcite or aragonite. Their shape can vary from rounded to leaf-shaped, often with fine growth lines or ribbing. When paired and intact, they are highly sought after due to their rarity and scientific significance.

Geological Context: The Oxford Clay Formation is among the most productive marine Jurassic fossil beds in Europe. While it is famous for producing complete marine reptiles, ammonites, and fish, the preservation of delicate structures like aptychi is rare. These fossils are vital in the interpretation of ammonite biology and are often used in comparative anatomy studies.

Condition: Naturally preserved aptychi pair, as shown in photos. Very fine detail visible. Please see image for full sizing – Scale Rule Squares / Cube = 1cm.

Important Note:

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

A highly collectible and academically important fossil, ideal for advanced collectors, educational institutions, or enthusiasts of rare Jurassic marine life.

(Actual as seen)

Only 1 left in stock

SKU: VF0267 Category:

Description

RARE Fossil Ammonite Aptychi (Mouth Parts) – Oxford Clay Formation – Middle Jurassic – Peterborough, United Kingdom

This listing features an exceptionally rare pair of fossil ammonite aptychi, also referred to as jaw plates or opercula. These structures are often misidentified or overlooked but are now widely accepted as the calcified lower jaws or protective opercula of ammonites. This specimen was found in the famous Oxford Clay Formation near Peterborough, UK, a globally important site for marine Jurassic fossils.

Fossil Type: Aptychi (Mouthparts of Ammonites)

Likely Species: Indeterminate ammonite – possibly Kosmoceras or related genera (commonly found in the Oxford Clay)

Order: Ammonitida

Superfamily: Stephanoceratoidea

Geological Stage: Middle Jurassic – Callovian (~164 million years ago)

Formation: Oxford Clay Formation

Location: Peterborough, Cambridgeshire, United Kingdom

Depositional Environment: Deep marine basin – fine clay-rich sediments with low oxygen, favouring excellent fossil preservation

Biozone/Zone: Common zones in the region include the Kosmoceras jason and Sigaloceras calloviense zones (approximate)

Morphology Features: Aptychi are typically found as a symmetrical pair of small, flat, curved plates made of calcite or aragonite. Their shape can vary from rounded to leaf-shaped, often with fine growth lines or ribbing. When paired and intact, they are highly sought after due to their rarity and scientific significance.

Geological Context: The Oxford Clay Formation is among the most productive marine Jurassic fossil beds in Europe. While it is famous for producing complete marine reptiles, ammonites, and fish, the preservation of delicate structures like aptychi is rare. These fossils are vital in the interpretation of ammonite biology and are often used in comparative anatomy studies.

Condition: Naturally preserved aptychi pair, as shown in photos. Very fine detail visible. Please see image for full sizing – Scale Rule Squares / Cube = 1cm.

Important Note:

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

A highly collectible and academically important fossil, ideal for advanced collectors, educational institutions, or enthusiasts of rare Jurassic marine life.

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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