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 Lyme Regis Dorset UK – Genuine Black Ven Marls Lower Lias Specimen with COA

Promicroceras Calcite Ammonite Fossil Jurassic Coast Lyme Regis Dorset UK – Genuine Black Ven Marls Lower Lias Specimen with COA

£24.00

Authentic Promicroceras Calcite Ammonite Fossil from the Jurassic Coast, Dorset

This beautiful Promicroceras Calcite Ammonite Fossil comes from the world-famous Black Ven Marls of the Lower Lias Formation, part of the Jurassic Coast at Black Ven, Lyme Regis, Dorset, UK. It was discovered by our own team members, Alister and Alison, on 04 November 2025, and has been professionally cleaned, prepped, and treated by Alison to a high standard of preservation. Dating back approximately 195–200 million years, this ammonite originates from the Early Jurassic (Sinemurian) Stage, a period known for the diversification of marine life following the end-Triassic extinction. This specimen displays the elegant spiral form and fine detail that make Promicroceras one of the most iconic ammonites of the Jurassic Coast.

Geological and Scientific Context

Promicroceras belongs to the family Eoderoceratidae, within the superfamily Eoderoceratoidea and the order Ammonitida, an extinct group of marine cephalopods closely related to modern squids and cuttlefish. The genus is characteristic of the Lower Lias, where it defines the Promicroceras planicosta Biozone, a key stratigraphic interval used by geologists to date early Jurassic rocks throughout Europe. Fossils of Promicroceras are highly prized both for their scientific importance and for their distinctive coiled, ribbed morphology.

The Black Ven Marls, part of the Charmouth Mudstone Formation, are a series of fine-grained marine sediments deposited in a low-energy, shallow sea environment. These marls accumulated under calm, oxygen-poor conditions, which limited decay and scavenging, allowing marine remains to be preserved in extraordinary detail. Over millions of years, mineral-rich waters infiltrated the sediments, and calcite gradually replaced the original aragonite of the ammonite’s shell, creating the calcite-preserved fossil seen here. This natural replacement process retains the fine ribbing and surface textures, while imparting a soft sheen and light coloration characteristic of calcite fossils.

Morphology and Distinctive Features

Promicroceras ammonites are small but highly distinctive, known for their tight coiling (evolute shell) where all whorls are visible and evenly ribbed. The ribs extend cleanly across the flanks and curve gracefully toward a smooth keel along the venter (outer margin). The ribs are fine and regular, giving the shell a perfectly symmetrical and rhythmic pattern that makes Promicroceras one of the most aesthetically appealing ammonites of the Lower Lias.

This specimen exhibits beautiful calcite preservation, with soft, natural hues and subtle translucence highlighting the ammonite’s elegant spiral. The fine ribbing and intricate suture lines are exceptionally well-preserved, demonstrating the high quality of Alison’s preparation work. The ammonite’s small size belies its scientific and aesthetic significance—each whorl encapsulates millions of years of evolutionary history. In life, Promicroceras was a free-swimming, nektonic predator, using jet propulsion to move through the Early Jurassic seas, preying on small crustaceans and planktonic organisms. Its hydrodynamic shell design allowed for efficient buoyancy control and quick manoeuvring in open water.

Geological Age and Depositional Environment

This fossil dates to the Sinemurian Stage of the Lower Jurassic, around 197 million years ago, a period when southern England lay beneath warm, shallow seas teeming with life. The fine clays and muds of the Black Ven Marls were deposited on a seabed where low oxygen and gentle sedimentation rates provided ideal conditions for fossil preservation. These deposits, now exposed along the cliffs of the Jurassic Coast, are globally significant for their diversity of ammonites, marine reptiles, and invertebrate fossils.

The Jurassic Coast, designated as a UNESCO World Heritage Site, represents one of the most complete and continuous geological records in the world, spanning 185 million years of Earth’s history. Fossils like this Promicroceras provide critical evidence for reconstructing ancient marine ecosystems and for understanding the early evolution of ammonites following the end-Triassic extinction.

Preparation and Provenance

This specimen was discovered and prepared entirely by our in-house team, ensuring full traceability and professional handling from collection to display. Alison’s preparation process involved meticulous cleaning and stabilisation to reveal the natural calcite surface without compromising its structure. No artificial colouring or enhancement has been applied—the beautiful sheen and texture are completely natural. Every fossil we sell is 100% genuine and comes with a Certificate of Authenticity, confirming its species identification, locality, and geological context.

Our team adheres to ethical collecting practices, and each fossil is handled with respect for both its scientific importance and its historical value. This Promicroceras specimen represents a timeless piece of Dorset’s geological legacy, preserved with care and expertise.

Size and Presentation

Scale cube = 1 cm. Please refer to the photographs for full sizing details. The images show the exact specimen you will receive—not a stock image. The ammonite is embedded within its natural marl matrix, providing contrast that enhances its delicate ribbed structure. The combination of soft calcite lustre and the subtle tones of the surrounding matrix makes this a visually stunning piece suitable for display, education, or collection.

A Collector’s Fossil from the Heart of the Jurassic Coast

This Promicroceras Calcite Ammonite Fossil from Black Ven, Lyme Regis, is a superb representation of Dorset’s world-renowned fossil heritage. Expertly prepared and beautifully preserved, it embodies the artistry of natural processes and the enduring fascination of the Early Jurassic seas—a genuine collector’s specimen from Britain’s iconic Jurassic Coast.

(Actual as seen)

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Description

Authentic Promicroceras Calcite Ammonite Fossil from the Jurassic Coast, Dorset

This beautiful Promicroceras Calcite Ammonite Fossil comes from the world-famous Black Ven Marls of the Lower Lias Formation, part of the Jurassic Coast at Black Ven, Lyme Regis, Dorset, UK. It was discovered by our own team members, Alister and Alison, on 04 November 2025, and has been professionally cleaned, prepped, and treated by Alison to a high standard of preservation. Dating back approximately 195–200 million years, this ammonite originates from the Early Jurassic (Sinemurian) Stage, a period known for the diversification of marine life following the end-Triassic extinction. This specimen displays the elegant spiral form and fine detail that make Promicroceras one of the most iconic ammonites of the Jurassic Coast.

Geological and Scientific Context

Promicroceras belongs to the family Eoderoceratidae, within the superfamily Eoderoceratoidea and the order Ammonitida, an extinct group of marine cephalopods closely related to modern squids and cuttlefish. The genus is characteristic of the Lower Lias, where it defines the Promicroceras planicosta Biozone, a key stratigraphic interval used by geologists to date early Jurassic rocks throughout Europe. Fossils of Promicroceras are highly prized both for their scientific importance and for their distinctive coiled, ribbed morphology.

The Black Ven Marls, part of the Charmouth Mudstone Formation, are a series of fine-grained marine sediments deposited in a low-energy, shallow sea environment. These marls accumulated under calm, oxygen-poor conditions, which limited decay and scavenging, allowing marine remains to be preserved in extraordinary detail. Over millions of years, mineral-rich waters infiltrated the sediments, and calcite gradually replaced the original aragonite of the ammonite’s shell, creating the calcite-preserved fossil seen here. This natural replacement process retains the fine ribbing and surface textures, while imparting a soft sheen and light coloration characteristic of calcite fossils.

Morphology and Distinctive Features

Promicroceras ammonites are small but highly distinctive, known for their tight coiling (evolute shell) where all whorls are visible and evenly ribbed. The ribs extend cleanly across the flanks and curve gracefully toward a smooth keel along the venter (outer margin). The ribs are fine and regular, giving the shell a perfectly symmetrical and rhythmic pattern that makes Promicroceras one of the most aesthetically appealing ammonites of the Lower Lias.

This specimen exhibits beautiful calcite preservation, with soft, natural hues and subtle translucence highlighting the ammonite’s elegant spiral. The fine ribbing and intricate suture lines are exceptionally well-preserved, demonstrating the high quality of Alison’s preparation work. The ammonite’s small size belies its scientific and aesthetic significance—each whorl encapsulates millions of years of evolutionary history. In life, Promicroceras was a free-swimming, nektonic predator, using jet propulsion to move through the Early Jurassic seas, preying on small crustaceans and planktonic organisms. Its hydrodynamic shell design allowed for efficient buoyancy control and quick manoeuvring in open water.

Geological Age and Depositional Environment

This fossil dates to the Sinemurian Stage of the Lower Jurassic, around 197 million years ago, a period when southern England lay beneath warm, shallow seas teeming with life. The fine clays and muds of the Black Ven Marls were deposited on a seabed where low oxygen and gentle sedimentation rates provided ideal conditions for fossil preservation. These deposits, now exposed along the cliffs of the Jurassic Coast, are globally significant for their diversity of ammonites, marine reptiles, and invertebrate fossils.

The Jurassic Coast, designated as a UNESCO World Heritage Site, represents one of the most complete and continuous geological records in the world, spanning 185 million years of Earth’s history. Fossils like this Promicroceras provide critical evidence for reconstructing ancient marine ecosystems and for understanding the early evolution of ammonites following the end-Triassic extinction.

Preparation and Provenance

This specimen was discovered and prepared entirely by our in-house team, ensuring full traceability and professional handling from collection to display. Alison’s preparation process involved meticulous cleaning and stabilisation to reveal the natural calcite surface without compromising its structure. No artificial colouring or enhancement has been applied—the beautiful sheen and texture are completely natural. Every fossil we sell is 100% genuine and comes with a Certificate of Authenticity, confirming its species identification, locality, and geological context.

Our team adheres to ethical collecting practices, and each fossil is handled with respect for both its scientific importance and its historical value. This Promicroceras specimen represents a timeless piece of Dorset’s geological legacy, preserved with care and expertise.

Size and Presentation

Scale cube = 1 cm. Please refer to the photographs for full sizing details. The images show the exact specimen you will receive—not a stock image. The ammonite is embedded within its natural marl matrix, providing contrast that enhances its delicate ribbed structure. The combination of soft calcite lustre and the subtle tones of the surrounding matrix makes this a visually stunning piece suitable for display, education, or collection.

A Collector’s Fossil from the Heart of the Jurassic Coast

This Promicroceras Calcite Ammonite Fossil from Black Ven, Lyme Regis, is a superb representation of Dorset’s world-renowned fossil heritage. Expertly prepared and beautifully preserved, it embodies the artistry of natural processes and the enduring fascination of the Early Jurassic seas—a genuine collector’s specimen from Britain’s 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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