Description
Genuine Phymatoceras robustum Ammonite Fossil from the UK
This is a genuine Phymatoceras robustum ammonite fossil from the Upper Toarcian Stage of the Lower Jurassic, collected from the UK. Dating to approximately 180 million years ago, this fossil represents a classic British Jurassic ammonite from a time when much of Britain was covered by warm marine seas filled with cephalopods, belemnites, bivalves, fish, and marine reptiles.
This fossil is a carefully chosen specimen, with the photograph showing the actual ammonite you will receive. Full sizing can be seen in the photo. The fossil also includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as a genuine specimen suitable for collecting, display, education, or gifting.
Fossil Type and Species
Phymatoceras robustum is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, and nautilus. Ammonites lived inside coiled, chambered shells. The animal occupied the final body chamber, while the earlier internal chambers helped control buoyancy, allowing the ammonite to move through the Jurassic sea.
The genus Phymatoceras is a well-known Toarcian ammonite group and is generally placed within the order Ammonitida, superfamily Hildoceratoidea, and family Hildoceratidae. Hildoceratid ammonites are especially important in Lower Jurassic stratigraphy because they evolved rapidly and are widely used for dating and correlating marine rock layers. The species name robustum reflects the strong, robust appearance associated with this ammonite form.
Upper Toarcian Lower Jurassic Age
This specimen dates to the Upper Toarcian, the later part of the Toarcian Stage within the Lower Jurassic Period. The Toarcian is one of the most important intervals for ammonite collectors and palaeontologists because it produced a wide variety of distinctive ammonite groups. Ammonites from this stage are highly useful as index fossils, helping geologists divide Lower Jurassic rocks into detailed biozones based on their changing shell forms.
During the Upper Toarcian, Britain lay within a broad epicontinental sea connected to wider European marine basins. Sediments accumulated on the sea floor as muds, clays, silts, marls, and limestones, depending on local conditions. After death, ammonite shells could settle into the sediment, become buried, and slowly fossilise over millions of years. Natural compression, mineral staining, matrix attachment, shell wear, and surface texture are all part of the fossil’s authentic geological history.
British Jurassic Geological Setting
British Lower Jurassic rocks are famous for their ammonites, especially from classic coastal and inland exposures where Toarcian strata preserve rich marine fossil assemblages. These deposits record a period of changing sea levels, shifting oxygen conditions, and evolving marine ecosystems. Ammonites such as Phymatoceras are important because their shells provide both attractive collectable fossils and scientific evidence for the age and environment of the rocks in which they are found.
The UK’s Jurassic fossil record is internationally recognised, and ammonites from these deposits have been studied for generations. Specimens from the Upper Toarcian are particularly interesting because they represent a later phase of Early Jurassic ammonite evolution, when ornate and strongly sculptured hildoceratid forms were widespread across European seas.
Morphology and Display Features
Phymatoceras robustum is valued for its bold Jurassic ammonite form. The shell is planispirally coiled, forming the classic flat spiral shape associated with ammonites. The whorls may show strong ornamentation, including ribbing and sculptural shell features that give the fossil an attractive, textured appearance. These natural features record the growth of the shell and help distinguish Phymatoceras from smoother or less ornamented ammonite groups.
As a display fossil, this specimen has strong visual appeal. The coiled shell form is instantly recognisable, while the robust structure and Lower Jurassic age make it a desirable addition to a fossil cabinet, geology collection, educational display, or natural history arrangement. Any natural marks, matrix, mineral colour variation, or surface imperfections should be viewed as part of the fossil’s genuine formation and preservation.
Certificate of Authenticity Included
This Phymatoceras robustum ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The photograph shows the actual fossil you will receive, making it a carefully selected individual piece rather than a stock image. It is ideal for collectors of British ammonites, Lower Jurassic fossils, Toarcian ammonites, natural history specimens, and authentic prehistoric marine life.
With its Upper Toarcian age, UK origin, classic ammonite form, and collectable Jurassic character, this fossil offers a tangible connection to the ancient seas that once covered Britain during the Lower Jurassic.
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