Rare Golden Pyrite Oxynoticeras oxynotum Ammonite Fossil Upper Sinemurian Jurassic Bishops Cleeve Wiltshire Gloucestershire UK

Description

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Golden Pyrite Oxynoticeras oxynotum Ammonite Fossil Upper Sinemurian Jurassic Gloucestershire UK

Rare Golden Pyrite Oxynoticeras oxynotum Ammonite Fossil Upper Sinemurian Jurassic Bishops Cleeve Wiltshire Gloucestershire UK

Detailed Description

Genuine Golden Pyrite Ammonite from Gloucestershire

This striking specimen is a Golden Pyrite Oxynoticeras oxynotum ammonite fossil from the Upper Sinemurian stage of the Early Jurassic Period, approximately 197–190 million years old. Collected from the world-renowned deposits of Bishops Cleeve, Gloucestershire, United Kingdom, this fossil displays exceptional natural pyritisation, giving it a metallic golden sheen that makes it highly desirable for collectors. The photographs show the actual specimen you will receive, and a 1 cm scale cube is provided to give precise sizing reference. Each fossil comes with a Certificate of Authenticity confirming its genuine origin.

Geological Setting and Age

The Upper Sinemurian stage of the Jurassic was a period when warm, shallow seas covered much of present-day Gloucestershire and Wiltshire. These seas deposited fine muds and clays that preserved marine life in extraordinary detail. Under the unique geochemical conditions of these beds, ammonites such as Oxynoticeras oxynotum underwent mineral replacement, resulting in the growth of iron pyrite crystals throughout the shell. This natural process created the remarkable golden pyrite ammonites, which are both scientifically significant and visually striking.

Morphology and Identification

Oxynoticeras oxynotum belongs to the family Oxynoticeratidae within the order Ammonitida. This species is characterised by:

• Compressed, discoidal shells with relatively narrow whorls.
• A sharp venter or keel, giving the fossil a streamlined and hydrodynamic form.
• Distinct ribbing patterns that are accentuated by the golden pyrite mineralisation.
• Evolute coiling, with earlier whorls clearly visible in mature specimens.

These features not only make Oxynoticeras an excellent example of ammonite evolution but also provide paleontologists with valuable information about the faunal succession and environmental conditions of the Early Jurassic seas.

Scientific and Stratigraphic Importance

Ammonites such as Oxynoticeras oxynotum are vital index fossils for the Sinemurian stage, allowing geologists to correlate rock strata across Europe. Their widespread distribution and rapid evolutionary turnover make them key tools for biostratigraphy. The golden pyrite preservation enhances their scientific and collector value, as the mineralisation often captures fine shell details that would otherwise be lost in ordinary preservation.

Collecting and Display Qualities

This specimen is not only scientifically valuable but also an exquisite display fossil. Its natural golden colouration, created by pyrite replacement, makes it a captivating piece for collectors, educational displays, or as a unique natural history gift. Unlike artificially polished specimens, the golden hue of this ammonite is entirely natural, a testament to millions of years of geological processes.

Key Details

• Species: Oxynoticeras oxynotum
• Age: Upper Sinemurian, Early Jurassic (~197–190 million years)
• Location: Bishops Cleeve, Gloucestershire, United Kingdom
• Order: Ammonitida
• Family: Oxynoticeratidae
• Preservation: Natural golden pyritisation
• Authenticity: 100% genuine specimen with Certificate of Authenticity
• Scale cube: 1 cm for accurate size reference

A Rare Window into the Jurassic Seas

This Golden Pyrite Oxynoticeras oxynotum ammonite fossil is a true geological treasure. It offers a glimpse into the Early Jurassic marine world of England while presenting itself as a naturally golden work of art. With its outstanding preservation, scientific significance, and undeniable aesthetic appeal, this specimen is perfect for collectors of fine ammonites, enthusiasts of British Jurassic fossils, and anyone who values the unique beauty of natural history.

Scale cube = 1 cm. Please see photographs for full sizing of the specimen.