Phlyseogrammoceras dispansum Ammonite Fossil | Toarcian, Jurassic | Ravenscar Yorkshire UK | Alice Purnell Collection

Description

Fossil Type & Species:

This listing features a genuine ammonite fossil of Phlyseogrammoceras dispansum, a distinctive and scientifically important ammonite species from the Toarcian Stage of the Lower Jurassic. This well-preserved specimen was collected from the Ravenscar area of North Yorkshire, United Kingdom, and forms part of the respected Alice Purnell Collection, known for rare, high-quality British fossils.

Geological Formation & Insight:

Phlyseogrammoceras is a genus within the family Hildoceratidae, and dispansum is a well-known species used in biostratigraphy to define the dispansum Subzone within the bifrons Zone of the Toarcian. It is easily recognised by its evolute, moderately compressed shell, well-defined ribbing, and often deep umbilicus.

This specimen comes from Lower Jurassic marine deposits, dated to approximately 183–180 million years ago, exposed along the cliffs near Ravenscar on the Yorkshire Coast, part of the famous Jurassic Coastline of northern England. The strata here belong to the Whitby Mudstone Formation, a fine-grained marine sediment ideal for fossil preservation.

The area was once a shallow sea rich in marine life, and the muds that accumulated on the seafloor created an anoxic environment, limiting decay and allowing excellent fossilisation. As a result, ammonites from Ravenscar often display exquisite shell detail, including preserved ribbing and suture lines.

Item Specifics:

• Fossil Type: Ammonite
• Species: Phlyseogrammoceras dispansum
• Geological Age: Toarcian Stage, Lower Jurassic (~183–180 million years ago)
• Formation: Whitby Mudstone Formation
• Locality: Ravenscar, North Yorkshire, United Kingdom
• Provenance: From the Alice Purnell Collection
• Preservation: Excellent – visible ribbing, whorl detail, and natural matrix contrast
• Colour: Typically grey-brown matrix with darker fossil shell
• Size: Please see scale cube in photo (each square = 1cm)
• Condition: 100% natural specimen with no restoration
• Specimen: You will receive the exact fossil shown in the photo

Authenticity Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This ammonite is part of the carefully curated Alice Purnell Collection, ensuring both scientific value and traceable provenance.

Shipping & Packaging:

Professionally packed and shipped with full tracking. An outstanding piece for fossil collectors, educators, natural history lovers, or as a one-of-a-kind prehistoric gift.

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