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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Cymbites Calcite Ammonite Fossil Jurassic Coast Black Ven Lyme Regis Dorset UK
Cymbites Calcite Ammonite Fossil Jurassic Coast Black Ven Lyme Regis Dorset UK - Image 2

Cymbites Calcite Ammonite Fossil Jurassic Coast Black Ven Lyme Regis Dorset UK

£10.20

Cymbites Calcite Ammonite Fossil

This listing is for a genuine Cymbites Calcite Ammonite Fossil from the Black Ven Marls, Lower Lias Formation, Black Ven, Lyme Regis, Dorset, UK, part of the world-renowned Jurassic Coast World Heritage Site. Dating to the Early Jurassic (Sinemurian stage, approximately 199–196 million years ago), this specimen is a fine example of one of the more unusual ammonite genera of the Lower Lias. It was discovered by our own team members, Alister and Alison, on 14th September 2025, and has been professionally cleaned, prepped, and treated by Alison to preserve its features and highlight its natural beauty.

Geological Context – Black Ven Marls, Dorset

The Black Ven Marls are some of the richest fossil-bearing deposits in Britain, famed for their ammonites, belemnites, crinoids, and occasional marine reptiles. Deposited in a shallow marine environment, these mudstones and marls provided the perfect conditions for fossilisation, rapidly burying marine organisms and preserving them in remarkable detail. Many ammonites from Black Ven are preserved in calcite, a process that strengthens the fossil and enhances its visibility, producing specimens of both scientific and aesthetic value.

Species Profile – Cymbites

The genus Cymbites belongs to the Order Ammonitida, Superfamily Psiloceratoidea, and Family Cymbitidae. These ammonites are particularly distinctive due to their compressed, discoidal shells with smooth or very finely ribbed whorls. Unlike many other ammonites of the Lower Jurassic, Cymbites often display relatively simple ornamentation, giving them a clean and elegant appearance. Their morphology suggests adaptations for a free-swimming nektonic lifestyle in the Early Jurassic seas.

Morphology and Preservation

This specimen clearly shows the typical discoidal shell form of Cymbites, with its flattened whorls and smooth calcite preservation. The ribbing, when present, is fine and understated, providing a contrast to the strongly ribbed genera that occur in the same beds. The calcite replacement of the original shell material has preserved the ammonite with durability and clarity, giving it both structural integrity and an attractive crystalline quality. Such preservation makes the fossil appealing both scientifically and as a display specimen.

Scientific and Stratigraphic Importance

Cymbites is a key genus of the Lower Sinemurian stage, occurring within the ammonite succession that defines early Jurassic biozones. Although less common than Promicroceras or Arnioceras, Cymbites holds significant value in biostratigraphy, contributing to the dating and correlation of Lower Lias rock layers across Europe. Its distinctive morphology and stratigraphic range make it an important fossil for understanding ammonite diversity and evolution during the Early Jurassic recovery phase following the Triassic–Jurassic extinction.

Ethical Discovery and Skilled Preparation

This fossil was responsibly collected from the Black Ven foreshore by our team and then expertly prepared by Alison, whose skill and experience ensure the specimen has been preserved with care. Ethical collecting supports the continued heritage of the Jurassic Coast while ensuring that specimens remain available for scientific study and private collections.

Authenticity and Presentation

All of our fossils are 100% genuine specimens and are supplied with a Certificate of Authenticity. The photographs show the exact specimen you will receive, not a stock image. For accurate sizing, a 1 cm scale cube is included in the photos. This carefully chosen Cymbites ammonite has been selected for its clarity and preservation, making it a superb addition to any collection, whether for display, education, or scientific appreciation.

This Cymbites Calcite Ammonite Fossil from the Black Ven Marls, Jurassic Coast, Lyme Regis, Dorset, UK, is a fine and rare example of an elegant Early Jurassic ammonite, combining geological significance with natural beauty.

 

(Actual as seen)

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Description

Cymbites Calcite Ammonite Fossil

This listing is for a genuine Cymbites Calcite Ammonite Fossil from the Black Ven Marls, Lower Lias Formation, Black Ven, Lyme Regis, Dorset, UK, part of the world-renowned Jurassic Coast World Heritage Site. Dating to the Early Jurassic (Sinemurian stage, approximately 199–196 million years ago), this specimen is a fine example of one of the more unusual ammonite genera of the Lower Lias. It was discovered by our own team members, Alister and Alison, on 14th September 2025, and has been professionally cleaned, prepped, and treated by Alison to preserve its features and highlight its natural beauty.

Geological Context – Black Ven Marls, Dorset

The Black Ven Marls are some of the richest fossil-bearing deposits in Britain, famed for their ammonites, belemnites, crinoids, and occasional marine reptiles. Deposited in a shallow marine environment, these mudstones and marls provided the perfect conditions for fossilisation, rapidly burying marine organisms and preserving them in remarkable detail. Many ammonites from Black Ven are preserved in calcite, a process that strengthens the fossil and enhances its visibility, producing specimens of both scientific and aesthetic value.

Species Profile – Cymbites

The genus Cymbites belongs to the Order Ammonitida, Superfamily Psiloceratoidea, and Family Cymbitidae. These ammonites are particularly distinctive due to their compressed, discoidal shells with smooth or very finely ribbed whorls. Unlike many other ammonites of the Lower Jurassic, Cymbites often display relatively simple ornamentation, giving them a clean and elegant appearance. Their morphology suggests adaptations for a free-swimming nektonic lifestyle in the Early Jurassic seas.

Morphology and Preservation

This specimen clearly shows the typical discoidal shell form of Cymbites, with its flattened whorls and smooth calcite preservation. The ribbing, when present, is fine and understated, providing a contrast to the strongly ribbed genera that occur in the same beds. The calcite replacement of the original shell material has preserved the ammonite with durability and clarity, giving it both structural integrity and an attractive crystalline quality. Such preservation makes the fossil appealing both scientifically and as a display specimen.

Scientific and Stratigraphic Importance

Cymbites is a key genus of the Lower Sinemurian stage, occurring within the ammonite succession that defines early Jurassic biozones. Although less common than Promicroceras or Arnioceras, Cymbites holds significant value in biostratigraphy, contributing to the dating and correlation of Lower Lias rock layers across Europe. Its distinctive morphology and stratigraphic range make it an important fossil for understanding ammonite diversity and evolution during the Early Jurassic recovery phase following the Triassic–Jurassic extinction.

Ethical Discovery and Skilled Preparation

This fossil was responsibly collected from the Black Ven foreshore by our team and then expertly prepared by Alison, whose skill and experience ensure the specimen has been preserved with care. Ethical collecting supports the continued heritage of the Jurassic Coast while ensuring that specimens remain available for scientific study and private collections.

Authenticity and Presentation

All of our fossils are 100% genuine specimens and are supplied with a Certificate of Authenticity. The photographs show the exact specimen you will receive, not a stock image. For accurate sizing, a 1 cm scale cube is included in the photos. This carefully chosen Cymbites ammonite has been selected for its clarity and preservation, making it a superb addition to any collection, whether for display, education, or scientific appreciation.

This Cymbites Calcite Ammonite Fossil from the Black Ven Marls, Jurassic Coast, Lyme Regis, Dorset, UK, is a fine and rare example of an elegant Early Jurassic ammonite, combining geological significance with natural beauty.

 

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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