RARE Pseudoschloenbachia youngi Ammonite Fossil Upper Santonian Cretaceous Madagascar COA

Description

Rare Pseudoschloenbachia youngi Ammonite Fossil

Offered here is a rare Pseudoschloenbachia youngi ammonite fossil from the Upper Santonian stage of the Late Cretaceous, found in Morondave, Madagascar. This stunning specimen dates back approximately 86 to 83 million years ago, a period when ammonites thrived in the warm tropical seas of the Tethys Ocean. Carefully chosen for quality and detail, this fossil is shown alongside a 1 cm scale cube to provide accurate size reference. The actual specimen photographed is the one you will receive, and it comes complete with a Certificate of Authenticity confirming it as a genuine fossil.

Geological Context – Upper Santonian, Madagascar

The Santonian stage sits within the Late Cretaceous and is a key interval in Earth’s history, marked by high sea levels and widespread chalk and limestone deposition. The region of Morondave in western Madagascar is world-renowned for its beautifully preserved Cretaceous ammonites, thanks to the island’s rich marine sedimentary record. Fossil-bearing strata here consist primarily of marls and fine-grained limestones, deposited in calm, shallow seas ideal for fossil preservation.

These deposits are significant not only for their fossil abundance but also for their clarity in stratigraphic correlation, as ammonites like Pseudoschloenbachia youngi provide vital biostratigraphic markers for the Upper Santonian stage.

Species Overview – Pseudoschloenbachia youngi

Pseudoschloenbachia belongs to the order Ammonitida, superfamily Acanthoceratoidea, and family Schloenbachiidae. The species Pseudoschloenbachia youngi is recognised by its distinctive shell morphology and ornate surface detail.

Key features include:

• Moderately involute, compressed shell with rounded flanks
• Strong ribbing running across the flanks, often bifurcating towards the outer whorl
• Small but noticeable tubercles (nodes) positioned along the ribs, enhancing its ornamentation
• A well-marked ventral keel, giving definition to the shell’s outline
• Complex suture patterns characteristic of advanced Cretaceous ammonites

These features make Pseudoschloenbachia youngi both scientifically valuable and aesthetically striking.

Scientific Importance

As an index fossil, Pseudoschloenbachia youngi is especially useful for dating Upper Santonian deposits. Its presence in Madagascar links these strata to other fossil-bearing sequences across Europe, Africa, and the Middle East, offering key insights into global ammonite distribution and biostratigraphy.

The robust ornamentation of this species may have provided defensive adaptations against predators such as marine reptiles and fish, while the streamlined shell shape would have allowed efficient movement through Late Cretaceous seas. Such details add to the understanding of ammonite paleobiology and the ecological dynamics of the Santonian stage.

Collector and Display Value

This rare ammonite fossil is not only a scientific specimen but also a striking display piece. Its ribbed ornamentation, preserved form, and origin from Madagascar—a locality famous for its high-quality ammonites—make it a desirable addition to any fossil collection.

Whether displayed privately, used for educational purposes, or added to a museum collection, this fossil represents a unique opportunity to own a genuine piece of Earth’s Cretaceous history.

Authenticity and Guarantee

• Genuine Pseudoschloenbachia youngi ammonite fossil
• Age: Upper Santonian stage, Late Cretaceous (approx. 86–83 million years old)
• Locality: Morondave, Madagascar
• Supplied with a Certificate of Authenticity
• The exact specimen photographed is the one you will receive

This rare ammonite fossil offers a tangible link to the ancient seas of Madagascar and will be a treasured addition to any serious fossil collection.