Description
Phylloceras nelsoni Ammonite Fossil – Lower Jurassic Marine Fossil from France
This genuine Phylloceras nelsoni ammonite fossil comes from the Lower Jurassic Toarcian deposits of the Mende Horizon, France. It is a carefully chosen fossil specimen, with the photo showing the actual piece you will receive. Full sizing can be seen in the photo. This authentic fossil also includes a Certificate of Authenticity lifetime guarantee generic card, making it a desirable specimen for collectors of ammonites, Jurassic fossils, French fossils and prehistoric marine life.
Geology and Age
This ammonite dates to the Toarcian Stage of the Lower Jurassic Period, an important interval in Earth history known for rich marine fossil assemblages and widespread ammonite-bearing sediments across Europe. The Toarcian represents a time when shallow to deeper marine environments covered large parts of what is now France, creating ideal conditions for the preservation of ammonites, belemnites, bivalves and other marine organisms.
The Mende Horizon is associated with Lower Jurassic fossil-bearing strata in France and is especially valued by collectors for its ammonite content. Fossils from this type of marine horizon record a dynamic Jurassic seaway where fine sediments accumulated on the sea floor, gradually burying shells and preserving them through mineralisation over millions of years.
During the Toarcian, ammonites were highly successful and diverse, making them especially important for dating and correlating Jurassic rocks. Their rapid evolution and wide distribution mean they are among the most useful index fossils in Mesozoic geology. A specimen such as Phylloceras nelsoni therefore has both display appeal and geological significance.
Fossil Type and Species
This specimen is identified as Phylloceras nelsoni, a Lower Jurassic ammonite belonging to the genus Phylloceras. Ammonites were extinct marine cephalopods related to modern squid, cuttlefish and nautilus. They possessed coiled, chambered shells, with the living animal occupying the final outer body chamber while the earlier internal chambers helped regulate buoyancy.
Phylloceras belongs to the order Ammonitida, family Phylloceratidae and superfamily Phylloceratoidea. Members of this group are well known for their elegant, often smooth to finely ornamented shells and complex suture patterns. The name Phylloceras refers to the leaf-like form of the sutures visible in well-preserved examples, a distinctive feature that gives the genus strong scientific interest.
Morphology and Natural Features
Phylloceras ammonites are typically recognised by their compressed, involute shell form, rounded whorl profile and refined ornamentation. Unlike some Jurassic ammonites with strong ribs, spines or tubercles, Phylloceras is often admired for its smoother, more graceful appearance. This gives specimens a classic, clean ammonite form that is highly attractive in fossil collections.
The shell was originally divided by internal walls called septa, forming a series of chambers. Where these septa met the shell wall, they produced intricate suture lines, one of the most important features used in ammonite classification. In phylloceratid ammonites, these sutures can be particularly elaborate, reflecting a highly developed shell structure.
As a living animal, Phylloceras nelsoni would have been part of the Jurassic marine ecosystem, moving through the water column and feeding as a cephalopod predator or opportunistic hunter. After death, the shell settled into sediment on the sea floor, where burial and geological processes eventually preserved it as a fossil.
Collector Appeal
A Phylloceras nelsoni ammonite from the Lower Jurassic Toarcian of France is a fine addition to any fossil collection, natural history display, geology cabinet or educational collection. Its combination of age, locality and attractive ammonite form makes it suitable for collectors interested in Jurassic marine fossils, European ammonites and classic cephalopod specimens.
French Jurassic ammonites are popular among collectors because they often come from historically important fossil-bearing regions with strong geological context. This specimen represents a genuine piece of ancient marine life from a time when ammonites were among the most successful animals in the world’s oceans.
Authenticity and Presentation
This is a genuine fossil specimen and includes a Certificate of Authenticity lifetime guarantee generic card for buyer confidence. The fossil has been carefully selected, and the listing photograph shows the actual specimen you will receive, allowing buyers to view its natural preservation, shape and individual character before purchase.
This authentic Lower Jurassic Phylloceras nelsoni ammonite fossil from the Toarcian Mende Horizon of France is ideal for fossil collectors, ammonite enthusiasts, geology displays and anyone seeking a genuine prehistoric marine fossil with strong scientific and visual appeal.
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