Siemiradzkia aurigus Ammonite Fossil Bathonian Jurassic France

Description

Genuine Siemiradzkia aurigus Ammonite Fossil

This is a genuine Siemiradzkia aurigus ammonite fossil from the Bathonian Stage of the Middle Jurassic. It was collected in Nièvre, Bourgogne-Franche-Comté, France, a region with fossil-bearing Jurassic sedimentary rocks. The photographs show the actual specimen offered, so the natural shell form, colour, matrix, preservation and geological features visible in the images belong to the fossil you will receive.

Geological Age and Environment

The Bathonian Stage forms part of the Middle Jurassic and dates to approximately 168 to 166 million years ago. During this interval, extensive areas of what is now France were covered by warm shallow seas. Fine sediment and carbonate material accumulated on the seabed, creating environments in which shells could be buried and preserved. Over millions of years, compaction and mineral-rich groundwater transformed the remains into fossils within solid rock.

About Siemiradzkia aurigus

Siemiradzkia aurigus is an ammonite associated with Bathonian marine deposits. Ammonites were extinct cephalopods related to modern squid, cuttlefish and nautiluses. They carried coiled external shells divided internally into chambers. The living animal occupied the final chamber, while the earlier chambers helped regulate buoyancy. Their familiar spiral geometry and ribbed ornament make ammonites among the most recognisable fossils from the Jurassic.

Each specimen has an individual combination of preserved shell, internal mould, mineral replacement, matrix and natural weathering. These are authentic results of fossilisation rather than manufactured imperfections. The details visible on this piece record its burial in an ancient marine sediment and its survival through an immense span of geological time.

Scientific and Collecting Interest

Ammonites evolved rapidly and were widely distributed through Jurassic seas. Palaeontologists use characteristic ammonite assemblages as guide fossils for comparing the relative ages of sedimentary strata. A Siemiradzkia aurigus specimen from the Bathonian therefore provides a tangible connection with the evidence used to reconstruct marine evolution and establish geological time.

This carefully selected fossil is suitable for an ammonite collection, educational display, geological study cabinet or natural-history interior. Its provenance in Nièvre will interest collectors of French fossils and European Jurassic material. It can also make a thoughtful gift for anyone fascinated by palaeontology, evolution or the ancient oceans.

Actual Specimen and Sizing

Please inspect every photograph closely because the images form an important part of the description. You will receive the exact fossil pictured rather than a substitute. Full sizing is shown in the photograph for a clear and accurate visual reference. Any matrix, irregular edges, mineral variation or weathering shown is part of the genuine specimen.

Certificate of Authenticity

A generic Certificate of Authenticity accompanies this fossil and carries our lifetime guarantee that it is genuine. This provides lasting reassurance and provenance for the collector. Handle the specimen carefully and keep it away from excessive humidity, prolonged direct sunlight and sudden temperature changes.