Description
Genuine Gonolkites convergens Ammonite Fossil
This is a genuine Gonolkites convergens ammonite fossil from the Lower Bathonian Stage of the Middle Jurassic. It was collected in Calvados, Normandy, France, an area noted for fossil-bearing Jurassic marine rocks. The photographs show the actual specimen offered for sale, so the natural shell form, preservation, colour, matrix and any geological features visible in the images belong to the fossil you will receive.
Geological Age and Setting
The Bathonian Stage forms part of the Middle Jurassic and dates to approximately 168 to 166 million years ago. During this time, large areas of north-western Europe were covered by warm shallow seas. Marine sediments accumulated on the seabed and preserved the remains of ammonites and other organisms. Calvados lies within Normandy, where coastal cliffs, quarries and inland exposures reveal an important sequence of Jurassic strata deposited in these ancient marine environments.
About Gonolkites convergens
Gonolkites convergens is an ammonite associated with Bathonian marine deposits. Like other ammonites, it possessed a coiled external shell divided internally into chambers. The living animal occupied the final chamber, while the earlier chambers helped control buoyancy. Ammonites were cephalopods related to modern squid, cuttlefish and nautiluses, although their lineage became extinct at the end of the Cretaceous Period.
The specimen displays the distinctive coiled geometry and ribbed ornament that make ammonites immediately recognisable. Fossilisation may preserve shell material, an internal mould, mineral replacement or areas of surrounding sediment. These features vary naturally between specimens and record the processes of burial, compaction and mineralisation that took place over millions of years.
Scientific and Collecting Interest
Ammonites evolved rapidly and were widely distributed through Jurassic seas. For this reason, palaeontologists use characteristic ammonite assemblages as guide fossils when comparing the relative ages of sedimentary rock layers. A Gonolkites convergens specimen from the Lower Bathonian is therefore more than an attractive display piece: it is a tangible example of the evidence used to reconstruct geological time, correlate strata and study the changing marine life of the Jurassic.
This carefully selected fossil is suitable for an ammonite collection, educational display, natural-history cabinet or geological study collection. Its French provenance will interest collectors of Normandy fossils and European Jurassic material. It can also make a thoughtful gift for anyone interested in palaeontology, evolution or the history of life.
Actual Specimen and Sizing
Please examine all photographs closely because they form an important part of the description. You will receive the exact fossil pictured, not a substitute specimen. Full sizing is shown in the photograph to provide an accurate visual reference. Any natural irregularities, matrix, weathering or mineral variation visible in the images are authentic characteristics of the fossil and its geological history.
Certificate of Authenticity
A generic Certificate of Authenticity is included with this specimen and carries our lifetime guarantee that it is a genuine fossil. This provides lasting reassurance and provenance for the collector. For preservation, handle the ammonite carefully and keep it away from excessive humidity, prolonged direct sunlight and sudden temperature changes.
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