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

Promicroceras Calcite Ammonite Fossil Jurassic Coast Black Ven Marls Lyme Regis Dorset UK

£36.00

Promicroceras Calcite Ammonite Fossil from the Jurassic Coast

This listing is for a Promicroceras Calcite Ammonite Fossil from the Black Ven Marls, Lower Lias Formation, Lyme Regis, Dorset, UK, part of the world-renowned Jurassic Coast World Heritage Site. This specimen dates to the Early Jurassic (Sinemurian stage, approximately 200 million years ago). It was discovered on 14th September 2025 by our own team members, Alister and Alison, and has been cleaned, prepped, and treated by Alison, ensuring the fossil’s fine natural details are beautifully preserved and ready for display or study.

Geological Context – Black Ven Marls, Lower Lias

The Black Ven Marls are among the most fossiliferous deposits on the Jurassic Coast, celebrated for producing beautifully preserved ammonites. These sedimentary layers were deposited in a shallow marine environment, where fine muds and calcareous material rapidly buried and preserved marine life. The Lower Lias is of immense importance to geologists and paleontologists because it preserves evidence of marine recovery and diversification following the end-Triassic mass extinction. Fossils from this formation are globally recognised as reference points in Early Jurassic stratigraphy and paleontology.

Species Profile – Promicroceras

The genus Promicroceras belongs to the Order Ammonitida, Superfamily Psiloceratoidea, and the Family Promicroceratidae. These small ammonites are iconic representatives of the Lower Jurassic, particularly within the Sinemurian stage. Promicroceras are characterised by their tightly coiled, involute shells, with narrow, rounded whorls and delicate ribbing that creates a finely ornamented spiral pattern. Despite their modest size, they played a crucial role in ammonite evolution, and their widespread presence makes them highly valuable as index fossils.

Morphology and Preservation

This specimen demonstrates the typical morphological traits of Promicroceras, with its compact spiral form, ribbed whorls, and elegant coiling. Unlike the pyritised “golden ammonites” of Charmouth, this fossil is preserved in calcite, a process that replaced the original aragonite shell with crystalline calcite. This type of preservation gives the fossil a more natural, earthy tone while still capturing the fine structural details of the shell. Calcite ammonites are particularly prized for the clarity of their features and their strong connection to the original marine environment in which they formed.

Stratigraphic and Scientific Importance

Promicroceras is one of the defining genera of the Promicroceras planicosta biozone within the Sinemurian stage. Because of their rapid evolutionary changes and broad distribution, these ammonites are essential tools in biostratigraphy, helping to date and correlate Lower Jurassic rock layers across different regions of Europe. Their abundance within the Black Ven Marls provides critical insight into the diversity of Early Jurassic ammonites and their role within marine ecosystems.

Ethical Discovery and Skilled Preparation

This ammonite was responsibly collected from Black Ven by our own team and meticulously prepared by Alison, who ensured that its natural details were revealed without damaging its structural integrity. Each specimen we offer is handled with the utmost care, reflecting both scientific respect and appreciation for the fossil’s natural beauty.

Authenticity and Presentation

Every fossil we supply is 100% genuine and is accompanied by a Certificate of Authenticity. The specimen photographed is the exact fossil you will receive, with a 1 cm scale cube included for accurate sizing reference. Carefully chosen for its quality and preservation, this calcite ammonite is a superb example of Promicroceras from one of the most famous fossil localities in the world.

This Promicroceras Calcite Ammonite Fossil from the Black Ven Marls of Lyme Regis, Dorset, UK, represents an authentic and scientifically significant piece of Jurassic history, combining fine preservation with natural beauty from the iconic Jurassic Coast.

(Actual as seen)

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Description

Promicroceras Calcite Ammonite Fossil from the Jurassic Coast

This listing is for a Promicroceras Calcite Ammonite Fossil from the Black Ven Marls, Lower Lias Formation, Lyme Regis, Dorset, UK, part of the world-renowned Jurassic Coast World Heritage Site. This specimen dates to the Early Jurassic (Sinemurian stage, approximately 200 million years ago). It was discovered on 14th September 2025 by our own team members, Alister and Alison, and has been cleaned, prepped, and treated by Alison, ensuring the fossil’s fine natural details are beautifully preserved and ready for display or study.

Geological Context – Black Ven Marls, Lower Lias

The Black Ven Marls are among the most fossiliferous deposits on the Jurassic Coast, celebrated for producing beautifully preserved ammonites. These sedimentary layers were deposited in a shallow marine environment, where fine muds and calcareous material rapidly buried and preserved marine life. The Lower Lias is of immense importance to geologists and paleontologists because it preserves evidence of marine recovery and diversification following the end-Triassic mass extinction. Fossils from this formation are globally recognised as reference points in Early Jurassic stratigraphy and paleontology.

Species Profile – Promicroceras

The genus Promicroceras belongs to the Order Ammonitida, Superfamily Psiloceratoidea, and the Family Promicroceratidae. These small ammonites are iconic representatives of the Lower Jurassic, particularly within the Sinemurian stage. Promicroceras are characterised by their tightly coiled, involute shells, with narrow, rounded whorls and delicate ribbing that creates a finely ornamented spiral pattern. Despite their modest size, they played a crucial role in ammonite evolution, and their widespread presence makes them highly valuable as index fossils.

Morphology and Preservation

This specimen demonstrates the typical morphological traits of Promicroceras, with its compact spiral form, ribbed whorls, and elegant coiling. Unlike the pyritised “golden ammonites” of Charmouth, this fossil is preserved in calcite, a process that replaced the original aragonite shell with crystalline calcite. This type of preservation gives the fossil a more natural, earthy tone while still capturing the fine structural details of the shell. Calcite ammonites are particularly prized for the clarity of their features and their strong connection to the original marine environment in which they formed.

Stratigraphic and Scientific Importance

Promicroceras is one of the defining genera of the Promicroceras planicosta biozone within the Sinemurian stage. Because of their rapid evolutionary changes and broad distribution, these ammonites are essential tools in biostratigraphy, helping to date and correlate Lower Jurassic rock layers across different regions of Europe. Their abundance within the Black Ven Marls provides critical insight into the diversity of Early Jurassic ammonites and their role within marine ecosystems.

Ethical Discovery and Skilled Preparation

This ammonite was responsibly collected from Black Ven by our own team and meticulously prepared by Alison, who ensured that its natural details were revealed without damaging its structural integrity. Each specimen we offer is handled with the utmost care, reflecting both scientific respect and appreciation for the fossil’s natural beauty.

Authenticity and Presentation

Every fossil we supply is 100% genuine and is accompanied by a Certificate of Authenticity. The specimen photographed is the exact fossil you will receive, with a 1 cm scale cube included for accurate sizing reference. Carefully chosen for its quality and preservation, this calcite ammonite is a superb example of Promicroceras from one of the most famous fossil localities in the world.

This Promicroceras Calcite Ammonite Fossil from the Black Ven Marls of Lyme Regis, Dorset, UK, represents an authentic and scientifically significant piece of Jurassic history, combining fine preservation with natural beauty from the iconic Jurassic Coast.

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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