BRASILIA Fossil Ammonite Block – Aalenian Jurassic – Beaminster Dorset UK – Rare Genuine Fossil with COA – Alice Purnell Collection

Description

Presenting a rare and well-preserved fossil ammonite block featuring BRASILIA, from the Aalenian Stage of the Lower Jurassic, collected in the region of Beaminster, Dorset, United Kingdom. This unique specimen comes from the esteemed Alice Purnell Collection and includes a Certificate of Authenticity ensuring its 100% genuine provenance.

The image shown is of the actual specimen for sale, and a scale cube is included for accurate sizing (1 cm squares).

Geological & Palaeontological Context:

• Genus: BRASILIA
• Geological Period: Jurassic
• Stage: Lower Aalenian (~174.1 to 170.3 million years ago)
• Formation: Lower part of the Inferior Oolite Group (specific local context not always formally defined in Beaminster area exposures)
• Location: Beaminster, Dorset, UK
• Depositional Environment: Shallow marine shelf setting within the epicontinental seas of the Jurassic period. Sediments are typically oolitic limestones, bioclastic wackestones, and marls, indicating oxygenated bottom waters and rich faunal assemblages.

Taxonomic Classification:

• Family: Hammatoceratidae
• Superfamily: Hammatoceratoidea
• Order: Ammonitida
• Suborder: Ammonitina
• Genus: BRASILIA
• Zone (if determinable): Potentially the Opalinum Zone, although site-specific stratigraphy in Beaminster can make precise zonation uncertain.

Morphological Features:

The genus BRASILIA is characterised by small to medium-sized planispiral, evolute ammonites with strong ribbing, typically with bifurcating or trifurcating ribs that arise from pronounced umbilical tubercles. The whorl section is typically compressed, and the venter may show a weak keel or rounded profile. This specimen showcases several ammonite individuals within the matrix, offering an exceptional multi-fossil display.

The preservation is excellent, revealing shell structure and suture patterns that make this a visually appealing and scientifically informative fossil.

Notable Attributes:

• Multi-ammonite fossil plate/block
• Sourced from a classic locality in Dorset
• Associated with Aalenian ammonite faunas often used in early Middle Jurassic biostratigraphy
• From the Alice Purnell Collection, a recognised source of carefully selected and curated British fossils

Additional Information:

• All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
• Scale Rule Squares / Cube = 1cm – please see photo for accurate sizing.
• The fossil shown is the exact one you will receive.
• This piece is a part of the highly regarded Alice Purnell Collection.

This is a premium-quality British ammonite fossil block, perfect for collectors, educators, or museum display. A superb representation of the Aalenian stage of the Jurassic, and a rare example of BRASILIA preserved in matrix from southern England.