Rare 5″ Clydoniceras discus Fossil Ammonite, Jurassic, Upper Bathonian, Shoncote Wilts UK, Genuine with COA

Description

Available here is a Rare 5″ Fossil Ammonite of Clydoniceras discus from the Upper Bathonian Stage of the Jurassic Period, collected at Shoncote, Wiltshire, United Kingdom. This striking specimen represents a distinctive member of the Middle Jurassic ammonite faunas and is rarely offered in such exceptional preservation and size.

The photographs show the actual fossil you will receive, professionally selected and prepared for display or research.

Scale Rule Squares / Cube = 1cm — see images for full sizing and detail.

Key Geological and Scientific Information:

• Species: Clydoniceras discus
• Fossil Type: Ammonite (extinct marine cephalopod)
• Geological Period: Jurassic
• Geological Stage: Upper Bathonian (~166 million years ago)
• Location: Shoncote, Wiltshire, England, UK
• Formation: Possibly Forest Marble or overlying beds typical of Bathonian sedimentation in southern England
• Order: Ammonitida
• Superfamily: Stephanoceratoidea
• Family: Morphoceratidae
• Described By: Buckman, early 20th century

Morphology Features:

Clydoniceras discus is characterised by its discoidal (flattened and wide) shell, with a very shallow whorl section and a broad venter. Ribbing is typically fine and close-set, curving slightly forward on the flanks and often disappearing near the outer edge. The whorls are tightly coiled, and the umbilicus is narrow and deep. These features make it a highly diagnostic ammonite and a desirable addition to any collection.

This particular specimen clearly exhibits the classic morphology of C. discus, including its elegant disc shape and defined ribbing — an excellent example of the species.

Depositional Environment:

The fossil comes from shallow marine shelf deposits, common to southern England during the late Middle Jurassic. These sediments, likely lime-rich marls or siltstones, allowed for excellent preservation of ammonite shells and other marine invertebrates.

Stratigraphic & Biozone Context:

Clydoniceras discus is associated with the Upper Bathonian ammonite faunas, especially within or near the Clydoniceras Zone — a subdivision used in regional stratigraphy of southern England and parts of northern France. Its limited stratigraphic range makes it useful for detailed correlation within the Bathonian succession.

Scientific Significance:

As a member of the family Morphoceratidae, Clydoniceras reflects a specialised evolutionary development in ammonite shell form and ornamentation during the Middle Jurassic. This species in particular is notable for its flattened shape, rare in most ammonite lineages. Its preservation and size make this specimen both scientifically informative and visually impressive.

Authenticity Guarantee:

All of our fossils are 100% genuine specimens, responsibly collected and prepared. Every piece comes with a Certificate of Authenticity, confirming its species identification, provenance, and geological age.

This Clydoniceras discus fossil ammonite is a rare and highly desirable example from the Upper Bathonian — perfect for collectors, educators, or anyone interested in Jurassic paleontology and the diversity of ammonite forms.