Phylloceras Fossil Ammonite, Oxfordian Jurassic, Madagascar – Authentic Collector Specimen with COA

Description

A stunning and genuine Phylloceras fossil ammonite, collected from Oxfordian Stage deposits of the Late Jurassic Period, found in Madagascar. This elegant fossil specimen is a classic representative of the smooth-shelled Phylloceratidae family, well known for their refined, high-suture ammonites.

Taxonomic Classification:

• Genus: Phylloceras
• Order: Ammonitida
• Superfamily: Phylloceratoidea
• Family: Phylloceratidae
• Originally described by Suess in 1865, Phylloceras is among the most long-lived and morphologically conservative Jurassic ammonites.

Geological Context:

• Stage: Oxfordian (Late Jurassic)
• Age: Approximately 163 to 157 million years old
• Location: Madagascar
• Depositional Environment: Open marine shelf or upper slope settings; Phylloceras species were nektonic, free-swimming ammonites that inhabited deeper waters than many contemporaries
• Biozone: Not zonally diagnostic but commonly occurs throughout Oxfordian strata in Madagascar and globally

Morphological Features:

• Highly involute coiling, with a smooth outer shell lacking prominent ribbing
• Finely preserved suture lines with intricate lobes and saddles
• Typically oval cross-section and compressed shell profile
• Often displays subtle iridescence or calcite preservation when polished

Scientific & Display Significance:

• Phylloceras is a key genus for understanding the evolution and diversity of early ammonites
• Its longevity and wide distribution make it important for global Jurassic biostratigraphy
• Madagascan specimens are admired for their preservation and are frequently used in educational collections and decorative fossil displays

The specimen shown includes a 1cm scale cube for reference. You will receive the exact fossil photographed, professionally prepared to best reveal its natural form.

Authenticity Guaranteed: This is a 100% genuine fossil ammonite, provided with a Certificate of Authenticity. A perfect specimen for fossil collectors, natural history enthusiasts, or educational display.

Please review the photographs for exact size and condition. A beautiful example of Oxfordian Phylloceras from Madagascar’s celebrated Jurassic marine deposits.