Lissoceras semicostulatum Ammonite Fossil | Romani Subzone, Bajocian, Jurassic | Oborne Wood Dorset UK | Alice Purnell Collection

Description

Fossil Type & Species:

This listing features a genuine ammonite fossil of Lissoceras semicostulatum, a refined and scientifically important ammonite species from the Romani Subzone of the Bajocian Stage, Middle Jurassic. This elegant fossil was collected at Oborne Wood, Dorset, United Kingdom, and comes from the highly regarded Alice Purnell Collection, known for premium British fossils with documented provenance.

Geological Formation & Insight:

Lissoceras is a genus within the family Lissoceratidae, characterised by its smooth, involute shells with subdued ribbing and a circular cross-section. The species Lissoceras semicostulatum is an important index species in the Romani Subzone, dating to the Middle Bajocian (~170 million years ago), and is widely used in biostratigraphy.

The specimen was collected from the Inferior Oolite Formation, a classic Middle Jurassic marine limestone unit in southern England. During the Bajocian, the Dorset region was submerged beneath a warm, shallow sea — part of a vast shelf environment rich in marine life including ammonites, bivalves, brachiopods, and echinoderms.

Oborne Wood, near Sherborne in Dorset, is a significant site for well-preserved ammonite fossils from the Inferior Oolite. Fossils from this location are sought after for their aesthetic appeal, scientific value, and clarity of stratigraphic context.

Item Specifics:

• Fossil Type: Ammonite
• Species: Lissoceras semicostulatum
• Geological Age: Middle Bajocian Stage, Jurassic (~170 million years ago)
• Subzone: Romani Subzone
• Formation: Inferior Oolite
• Locality: Oborne Wood, Dorset, United Kingdom
• Provenance: From the Alice Purnell Collection
• Preservation: Excellent – smooth shell with subtle ribbing and natural matrix
• Colour: Natural fossil tones – typically light brown, beige, or grey matrix
• Size: Refer to photo – scale rule/cube = 1cm
• Condition: 100% natural; no restoration
• Specimen: You will receive the exact fossil shown in the photographs

Authenticity Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This Lissoceras semicostulatum fossil is from the expertly curated Alice Purnell Collection, ensuring scientific credibility and collector-grade quality.

Shipping & Packaging:

Professionally packed and shipped with full tracking. A rare and elegant ammonite fossil — ideal for fossil collectors, natural history enthusiasts, educators, or as a distinctive gift.

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