Rare Zucheria ubaldi Ammonite Fossil, Middle Bajocian Stage Jurassic, Authentic Southwest England United Kingdom

Description

Authentic Jurassic Ammonite Fossil

This listing presents a genuine Zucheria ubaldi Ammonite Fossil from the Middle Bajocian Stage of the Jurassic, found in Southwest England, United Kingdom. Ammonites are extinct marine molluscs belonging to the subclass Ammonoidea, closely related to squid and cuttlefish. Their chambered, coiled shells enabled buoyancy control and efficient swimming, making them dominant marine predators for millions of years. The specimen offered here has been carefully chosen for both its preservation and provenance. A 1 cm scale cube is included in the photographs to provide accurate sizing.

Geological Context – Middle Bajocian, Jurassic

The Bajocian Stage, part of the Middle Jurassic (around 170–168 million years ago), is a key interval in ammonite evolution and biostratigraphy. This stage is characterised by a wide radiation of ammonite families, many of which became important index fossils used by geologists to correlate sedimentary layers across Europe and beyond.

In Southwest England, the Middle Jurassic seas formed shallow marine environments connected to the Tethys Ocean. These conditions were ideal for the preservation of ammonites, with fine sediments covering shells soon after deposition. The result is a fossil record that preserves exquisite details of ammonite morphology, making these specimens valuable for collectors and scientific study.

Species Profile – Zucheria ubaldi

The species Zucheria ubaldi is part of the order Ammonitida, within the superfamily Stephanoceratoidea, a group well known for their robust shells and distinctive ribbing patterns.

Notable features of Zucheria ubaldi ammonites include:

• A moderately involute to evolute shell with clearly visible whorls.
• Strong, regular ribbing that often bifurcates from the umbilical edge toward the venter.
• A rounded venter where ribs cross uninterrupted.
• Well-developed sutures, reflecting the complex internal chamber system typical of Jurassic ammonites.

These features make Zucheria ubaldi easily distinguishable and scientifically valuable as a biostratigraphic marker within the Middle Bajocian.

Paleoenvironment and Scientific Importance

During the Bajocian, Southwest England was submerged under shallow epicontinental seas rich in marine life. Ammonites like Zucheria ubaldi lived as nektonic predators, feeding on small crustaceans and planktonic organisms. Their rapid evolutionary turnover and widespread distribution mean they are excellent tools for biostratigraphy, helping scientists refine the Jurassic timescale and compare rock layers across Europe.

The presence of Zucheria ubaldi in these deposits highlights the evolutionary diversity of ammonites during the Middle Jurassic and provides important data for reconstructing paleoenvironments of the Tethyan realm.

100% Genuine with Certificate of Authenticity

All of our specimens are guaranteed 100% genuine fossils and are supplied with a Certificate of Authenticity. This assures collectors and enthusiasts that your ammonite is a true Jurassic specimen and not a reproduction or imitation.

A Collector’s and Display Fossil

This Zucheria ubaldi ammonite fossil from the Middle Bajocian of Southwest England is a rare and desirable specimen, combining historical geological significance with natural beauty. Its ribbed shell, excellent provenance, and scientific relevance make it an outstanding addition to any fossil collection, natural history display, or educational resource.

Scale Rule Squares / Cube = 1 cm. Please see listing photos for the full sizing of this exact specimen.