Rare Pseudogrammoceras fallaciosum Ammonite Fossil, Middle Toarcian Stage Jurassic, Authentic Aveyron France Collectors Specimen with COA

Description

Authentic Jurassic Ammonite Fossil

This listing offers a genuine Pseudogrammoceras fallaciosum Ammonite Fossil from the Middle Toarcian Stage of the Early Jurassic, collected in Aveyron, France. Ammonites are extinct marine molluscs belonging to the subclass Ammonoidea and order Ammonitida. Related to squid and cuttlefish, they are among the most iconic fossils known, prized for their beauty and their importance to paleontology. The specimen pictured is the exact one you will receive, with a 1 cm scale cube included to provide accurate sizing.

Geological Context – Middle Toarcian, Jurassic

The Middle Toarcian, approximately 178–177 million years ago, represents a period following the Early Toarcian Oceanic Anoxic Event, a major climatic and oceanographic event that influenced marine ecosystems worldwide. The deposits of Aveyron in southern France are rich in ammonites from this interval, preserved in fine sediments that capture extraordinary detail.

Ammonites from the Toarcian are crucial as index fossils. Their rapid evolution and wide geographic spread make them essential tools for dividing the Jurassic into ammonite biozones. Fossils such as Pseudogrammoceras fallaciosum are therefore highly significant for correlating Jurassic strata across Europe.

Species Profile – Pseudogrammoceras fallaciosum

The species Pseudogrammoceras fallaciosum belongs to the family Graphoceratidae, within the superfamily Hildoceratoidea. This group is known for its compressed shell morphology, elegant ribbing, and stratigraphic importance during the Toarcian Stage.

Key identifying features of Pseudogrammoceras fallaciosum include:

• A moderately evolute shell, with inner whorls visible within the umbilicus.
• Fine, closely spaced ribbing running across the flanks toward the keel.
• A smooth venter with a subtle keel that enhanced hydrodynamic movement.
• Complex suture lines revealing the intricate internal chamber divisions.

These traits distinguish Pseudogrammoceras fallaciosum from related genera and make it both scientifically valuable and visually striking for collectors.

Paleoenvironment and Scientific Importance

During the Middle Toarcian, southern France lay beneath warm, shallow seas. Ammonites like Pseudogrammoceras fallaciosum lived as nektonic predators, swimming actively and preying upon small marine invertebrates. Their shells, upon death, sank to the seabed and were rapidly buried in fine sediments, preserving them as fossils for over 175 million years.

The importance of Pseudogrammoceras fallaciosum lies in its use as a biozonal marker within the Toarcian Stage. Its restricted range makes it invaluable for precisely dating Jurassic deposits and correlating layers between distant regions. Collectors value this species for both its scientific role and the refined elegance of its ribbing and shell form.

100% Genuine with Certificate of Authenticity

All of our fossils are guaranteed 100% genuine specimens and include a Certificate of Authenticity. This ammonite is not a reproduction or cast but an authentic relic of the Jurassic seas, preserved naturally in stone for nearly 178 million years.

A Collector’s and Display Fossil

This Pseudogrammoceras fallaciosum ammonite fossil from the Middle Toarcian of Aveyron, France is an exceptional addition to any fossil collection. Its distinctive ribbing, geological provenance, and paleontological importance make it a prized display piece for collectors, educators, and natural history enthusiasts alike.

Scale Rule Squares / Cube = 1 cm. Please see listing photos for the full sizing of this exact specimen.