Golden Pyrite Oxynoticeras oxynotum Ammonite Fossil Jurassic Whitby UK Genuine Specimen Certificate

Description

Genuine Jurassic Fossil – Golden Pyrite Oxynoticeras oxynotum Ammonite

This listing is for a spectacular Golden Pyrite Fossil Ammonite, Oxynoticeras oxynotum, collected from the world-famous fossil beds of Runswick Bay, Whitby, United Kingdom. Dating to the Middle Lias (Lower Jurassic), approximately 180 million years old, this ammonite has been naturally preserved in gleaming iron pyrite, giving it a brilliant golden finish. Every specimen is individually photographed so you receive the exact fossil shown, and each comes with a Certificate of Authenticity.

Geological Age and Provenance

The fossil originates from the Jurassic Period, specifically the Middle Lias, Lower Jurassic, within the Upper Pliensbachian stage. Runswick Bay and the wider Whitby coastline are celebrated worldwide for their fossil-rich shales and nodules. Here, chemical conditions in the sediments created the rare phenomenon of pyritisation, replacing the original shell material with golden iron pyrite. This remarkable process makes Whitby one of the few places on Earth to yield such dazzling golden ammonites, prized by both collectors and scientists.

Fossil Type and Classification

This specimen is identified as Oxynoticeras oxynotum, a species within the family Oxynoticeratidae, superfamily Eoderoceratoidea, and order Ammonitida. Ammonites were extinct cephalopods, close relatives of modern squids and octopuses. Their coiled, chambered shells enabled them to regulate buoyancy and move efficiently through Jurassic seas. Oxynoticeras oxynotum is an iconic ammonite from the Whitby region and is an important index fossil, defining the Oxynotum Biozone, a crucial division within the Jurassic time scale.

Morphology and Distinctive Features

The shell of Oxynoticeras oxynotum is notable for:

• A compressed, discoidal form with flat sides and a sharp venter.
• A well-developed keel running along the venter, a defining feature of the species.
• Fine, closely spaced ribs crossing the flanks and extending towards the keel.
• A relatively narrow umbilicus, exposing only a small portion of inner coils.
• Natural golden pyrite preservation, which highlights intricate details and provides exceptional display value.

These traits make this ammonite one of the most striking and scientifically recognisable fossils from the Whitby coast.

Biozone and Scientific Importance

Oxynoticeras oxynotum lends its name to the Oxynotum Biozone of the Lower Jurassic. Its abundance, distinctive morphology, and widespread distribution across Europe make it one of the most important index fossils used by geologists to date and correlate Jurassic rocks. Specimens such as this one are vital not only for collectors but also for paleontologists studying the evolution and distribution of ammonites.

Depositional Environment

During the Early Jurassic, Whitby was submerged beneath a shallow sea where fine muds and silts accumulated on the seabed. In some layers, oxygen levels were low, creating conditions favourable for exceptional preservation. Here, mineralisation replaced the original ammonite shells with iron pyrite, producing the brilliant golden fossils that have made the region world-famous. These fossils provide a unique combination of scientific value and natural artistry.

Historical and Collecting Value

Whitby ammonites have been treasured since the Victorian era, when collectors and naturalists first made the region famous. Pyritised ammonites such as this were admired not only for their beauty but also for their scientific significance. Today, golden ammonites remain among the most iconic British fossils, highly sought after by collectors worldwide. Their natural metallic brilliance makes them stand out as both museum-quality scientific specimens and decorative display pieces.

Authenticity and Presentation

• 100% Genuine Fossil Specimen
• Species: Oxynoticeras oxynotum
• Preservation: Natural pyritisation (golden iron pyrite)
• Age: Jurassic, Middle Lias, approx. 180 million years old
• Location: Runswick Bay, Whitby, United Kingdom
• Supplied with a Certificate of Authenticity
• Scale cube in photographs = 1 cm for accurate sizing
• The specimen pictured is the exact fossil you will receive

This exceptional Golden Pyrite Oxynoticeras oxynotum ammonite fossil is a rare collector’s piece from Whitby’s Jurassic heritage. Combining natural beauty, geological importance, and historical value, it is an outstanding addition to any fossil collection.