Hemihoploceras fraasi Fossil Ammonite, Oxfordian Jurassic, Sakahara Tulear Madagascar – Authentic Specimen with COA

Description

Available now is a rare and genuine Hemihoploceras fraasi fossil ammonite, originating from Sakahara, near Tulear, Madagascar, and dating to the Oxfordian Stage of the Upper Jurassic Period. This is a highly sought-after genus, particularly admired for its detailed ribbing and distinct shell structure.

Taxonomic Classification:

• Genus: Hemihoploceras
• Species: fraasi
• Order: Ammonitida
• Superfamily: Perisphinctoidea
• Family: Oppeliidae
• First formally described in the 19th century, Hemihoploceras represents an important branch in the evolution of Jurassic ammonites

Geological Context:

• Location: Sakahara, near Tulear, Madagascar
• Stage: Oxfordian (Upper Jurassic)
• Age: Approximately 163 to 157 million years old
• Formation: Marine sedimentary limestones and marls of the southwestern Madagascan Jurassic platform
• Depositional Environment: Shallow to moderately deep tropical marine shelf, with good oxygenation allowing for excellent fossil preservation
• Biozone: Frequently associated with the Gregoriceras transversarium and Perisphinctes biozones in global Oxfordian stratigraphy

Morphological Features:

• Strong evolute coiling with wide umbilicus
• Dense ribbing with well-defined bifurcating ribs crossing flanks and venter
• Occasionally displays faint tubercles along ventrolateral margins
• Robust, thick shell profile indicative of nektonic life habits
• Intricate suture lines preserved in well-prepared specimens

Scientific & Collector Significance:

• Hemihoploceras fraasi is a diagnostic ammonite species important for dating and correlating Oxfordian-age marine strata
• Its distinctive morphology makes it ideal for display and teaching purposes
• Madagascan Oxfordian sites such as Sakahara are renowned for their abundance of beautifully preserved ammonites

The specimen shown is the exact fossil you will receive, photographed with a 1cm scale cube for accurate sizing. It has been carefully chosen and professionally prepared to highlight its natural features.

Authenticity Guaranteed: This is a 100% genuine fossil ammonite, and comes with a Certificate of Authenticity. Ideal for collectors, educational institutions, or as a striking addition to any fossil display.

Please see all images for detailed views and full size references. A remarkable opportunity to acquire a classic Upper Jurassic ammonite from Madagascar.