Oxynoticeras Golden Pyrite Ammonite Fossil Black Ven Marls Lower Lias Jurassic Coast Lyme Regis Dorset UK

Description

Oxynoticeras – A Golden Pyrite Ammonite from the Jurassic Coast

This superb specimen is a genuine Oxynoticeras ammonite fossil, preserved in gleaming golden pyrite from the Black Ven Marls of the Lower Lias Formation, collected at Stonebarrow Cliff, Charmouth, Lyme Regis, Dorset, UK. Dating to the Lower Jurassic period (approximately 199–190 million years ago), this ammonite represents both the aesthetic appeal and scientific importance of fossils from the Jurassic Coast.

Discovered on 22 September 2025 by our skilled team members Alister and Alison, the specimen has been expertly cleaned, prepped, and treated by Alison, ensuring its natural detail is beautifully displayed. Each fossil we supply is 100% genuine and comes complete with a Certificate of Authenticity, guaranteeing its provenance.

Geological Setting – Black Ven Marls and Stonebarrow Cliff

The Black Ven Marls are a highly fossiliferous sequence of shales and mudstones within the Lower Lias, part of the world-famous Jurassic Coast UNESCO World Heritage Site. These rocks formed in shallow marine environments where fine-grained sediments enabled the preservation of delicate structures. Under unique geochemical conditions, ammonite shells were replaced by pyrite, creating the stunning golden preservation for which Lyme Regis fossils are so highly prized.

Stonebarrow Cliff, adjacent to Black Ven, is one of the most prolific collecting areas along the coast. Its exposures have yielded countless ammonites, making it a key site for both scientific research and collectors worldwide.

Species Profile – Oxynoticeras

Oxynoticeras is a distinctive genus of ammonites belonging to the order Ammonitida, within the subclass Ammonoidea. This genus is typical of the Sinemurian stage of the Lower Jurassic. It is recognised for its relatively involute shell, compressed whorls, and sharp keel running along the venter. Its ribbing is more subdued than in some other genera, giving the shell a smooth, streamlined appearance.

As with other ammonites, Oxynoticeras was a nektonic marine predator, preying on small invertebrates and planktonic life. Its shell structure provided buoyancy and hydrodynamic efficiency, reflecting the evolutionary success of ammonites during the early Jurassic seas.

Scientific and Collectible Importance

Oxynoticeras is an important index fossil, aiding in the dating and correlation of Lower Jurassic strata. Its presence in the Black Ven Marls helps paleontologists identify specific biozones, making it scientifically significant as well as visually striking.

For collectors, golden pyrite ammonites are particularly desirable. The metallic luster highlights every detail of the ammonite’s structure, transforming a prehistoric shell into a glittering natural treasure. Specimens like this from Lyme Regis are highly sought after, combining world-renowned locality, geological importance, and outstanding preservation.

Fossil Details

• Genus: Oxynoticeras
• Type: Golden Pyrite Ammonite Fossil
• Geological Formation: Black Ven Marls, Lower Lias
• Age: Lower Jurassic, Sinemurian (~199–190 million years ago)
• Location: Stonebarrow Cliff, Charmouth, Lyme Regis, Dorset, UK
• Discovered by: Alister and Alison
• Discovery Date: 22 September 2025
• Prepared by: Alison
• Guarantee: 100% genuine specimen with Certificate of Authenticity

The photographs show the exact specimen you will receive, with a 1 cm scale cube for accurate sizing. This Oxynoticeras golden pyrite ammonite fossil is a superb example of Jurassic preservation, making it an ideal addition to any collection of fossils or natural history displays.