Rare Brasilia platychora Fossil Ammonite Inferior Oolite Jurassic Coast Burton Bradstock Dorset UK Genuine Specimen with COA

Beautiful Brasilia platychora Ammonite from the Inferior Oolite, Jurassic Coast, Dorset, UK

This superb Brasilia platychora fossil ammonite was discovered by our own team members, Alister and Alison, on 2 October 2025, at Burton Bradstock, Dorset, United Kingdom, a renowned locality along the Jurassic Coast UNESCO World Heritage Site. Expertly cleaned, prepared, and treated by Alison, this specimen reveals exquisite ribbing and natural detail typical of the species. It originates from the Inferior Oolite Formation, dating to the Middle Jurassic Period (Bajocian Stage, approximately 170–168 million years ago). This ammonite is a fine example of a rare and scientifically important fossil from one of Britain’s most famous geological formations.

Geological and Depositional Context

The Inferior Oolite Formation represents a series of marine limestones, marls, and oolitic sediments laid down in the shallow tropical seas that covered southern England during the Middle Jurassic. These warm, clear waters provided an ideal habitat for a diverse marine fauna, including ammonites, belemnites, crinoids, and early marine reptiles.
At Burton Bradstock, the Inferior Oolite is beautifully exposed along the cliffs and foreshore, forming part of the Jurassic Coast, which spans 185 million years of geological history. The Bajocian deposits at this locality are especially fossiliferous, recording the rapid diversification of ammonite faunas that occurred following earlier Jurassic extinction events. The Brasilia platychora ammonite is found in the Garantiana Biozone, a distinctive interval within the Inferior Oolite that marks the middle Bajocian stage. Its presence in these deposits helps paleontologists correlate Jurassic strata across Europe.

Species Overview – Brasilia platychora

Brasilia platychora belongs to the family Stephanoceratidae, superfamily Stephanoceratoidea, order Ammonitida. It is characterised by its finely ribbed, moderately evolute shell with a distinctive broad, flattened whorl section and gently curving ribs. The ribs are typically strong and evenly spaced, often branching near the umbilicus and sweeping gracefully across the flanks to the venter. The result is a robust yet elegant shell with a beautiful rhythmic ornamentation, reflecting both strength and hydrodynamic efficiency.
This species represents an intermediate form within the evolutionary lineage of Bajocian ammonites, bridging between earlier Stephanoceras forms and later genera within the same family. Its balanced proportions and clear ribbing make it a highly aesthetic fossil as well as a scientifically valuable specimen.

Scientific and Historical Significance

Brasilia platychora holds importance in Jurassic stratigraphy as a diagnostic species within the middle Bajocian Garantiana Biozone, a horizon widely used for regional correlation across Europe. These ammonites are relatively uncommon in the British fossil record, particularly in such well-preserved condition. Their study helps paleontologists reconstruct evolutionary sequences and understand the environmental changes that influenced ammonite distribution and morphology during the Middle Jurassic.
Specimens from the Burton Bradstock Inferior Oolite are especially desirable because they exhibit exceptional preservation, often retaining fine surface ornamentation and clear ribbing. The fossil record from this region has been studied since the 19th century and remains vital to understanding Britain’s Jurassic marine ecosystems and paleogeography.

Condition, Provenance, and Authenticity

This is a 100% genuine fossil specimen, professionally collected, cleaned, and stabilised by Alison. The ammonite’s ribbing and overall form are beautifully preserved, with no artificial restoration. Its natural contrast between the matrix and fossil enhances its visual appeal, making it an ideal display or collector’s piece. The photograph shows the exact specimen you will receive, ensuring authenticity and transparency.
Every purchase includes a Certificate of Authenticity, confirming the specimen’s identification, locality, and geological age.

Details at a Glance

• Species: Brasilia platychora

• Family: Stephanoceratidae

• Superfamily: Stephanoceratoidea

• Order: Ammonitida

• Age: Bajocian Stage, Middle Jurassic (~170–168 million years ago)

• Biozone: Garantiana Biozone

• Formation: Inferior Oolite

• Locality: Burton Bradstock, Dorset, United Kingdom

• Discovered by: Alister and Alison on 02 October 2025

• Prepared by: Alison

• Condition: Genuine, professionally prepared fossil in excellent display condition

• Scale: Cube = 1 cm (see photo for full sizing)

• Included: Certificate of Authenticity

A Fine Collector’s Fossil from Britain’s Jurassic Heritage

This Brasilia platychora ammonite is a beautifully preserved specimen from the Inferior Oolite of Dorset, showcasing the artistry of nature and the geological richness of the Jurassic Coast. Its rarity, scientific significance, and superb aesthetic quality make it an exceptional addition to any fossil collection or natural history display.