Description
Genuine Valdedorsella akuschaensis Ammonite Fossil
This genuine ammonite fossil is identified as Valdedorsella akuschaensis and comes from France. It dates to the Barremian stage of the Lower Cretaceous. The photographs show the actual carefully chosen fossil offered for sale, so the ammonite pictured is the exact specimen you will receive.
Barremian Lower Cretaceous Age
The Barremian is an Early Cretaceous stage dating to approximately 129 to 125 million years ago. During this interval, large areas of southern Europe were influenced by the ancient Tethys Ocean. Warm marine waters supported ammonites, belemnites, bivalves, gastropods, echinoids, corals, and many other organisms.
After death, an ammonite shell could settle onto the seabed and become buried by fine marine sediment. Compaction, mineral replacement, and lithification preserved the shell or its internal mould. Later uplift, erosion, and weathering exposed fossil-bearing Lower Cretaceous rocks in France. This specimen is therefore a tangible record of a vanished marine ecosystem.
Valdedorsella akuschaensis
Valdedorsella was an extinct marine cephalopod with a planispirally coiled shell divided internally into chambers. The living animal occupied the final body chamber, while earlier sealed chambers helped regulate buoyancy. Ammonites were relatives of modern squid, cuttlefish, and nautiluses, although they formed their own highly diverse and now extinct group.
Fossil specialists distinguish ammonites by comparing shell shape, whorl proportions, umbilical width, ribbing, constrictions, tubercles, and the form of the outer edge. Valdedorsella is associated with the distinctive, often evolute and ornamented shells of heteromorph-related Lower Cretaceous ammonite lineages, while retaining regular coiling. Examine the photographs for the whorl profile, rib pattern, umbilical area, outer margin, natural matrix, and individual preservation visible on this Valdedorsella akuschaensis specimen.
Ammonites and Geological Dating
Ammonites evolved rapidly and were widely distributed through Mesozoic seas. Their changing shell forms make them valuable index fossils, enabling geologists to compare marine rock sequences and determine relative ages. Barremian ammonite assemblages are especially important in the correlation of Lower Cretaceous strata around the former Tethyan region.
A specimen identified to species carries more geological and biological context than one described only as broadly Cretaceous. It can be compared with related ammonites to illustrate evolutionary succession, geographical distribution, and the variety of shell architectures present in Early Cretaceous marine communities.
Tethyan Marine Environment
During the Barremian, carbonate mud, marl, sand, and fine sediment accumulated in marine basins and shelf settings connected to the Tethys Ocean. Water depth, currents, oxygenation, biological productivity, and sediment supply influenced both the living community and the conditions under which shells were preserved.
The chambered shell illustrates adaptation in a free-swimming cephalopod. Its construction combined strength with buoyancy control, while shell form and ornament may have affected hydrodynamics and resistance to pressure. Each fossil preserves a unique balance of original shell, mineral replacement, internal mould, surrounding sediment, and later geological alteration.
French Cretaceous Provenance
France contains internationally important Lower Cretaceous successions, particularly in its southern and southeastern regions. Many of these rocks were deposited in marine environments connected to the Tethys before later tectonic movements raised and deformed them. French Barremian ammonites have a long history of scientific study and collecting.
A documented French provenance adds geographical and educational value to this fossil. It can complement a collection arranged by country, geological stage, ammonite genus, fossil group, or ancient marine environment, and provides a tangible example of the rich Cretaceous palaeontology of continental Europe.
Natural Fossil Character
Natural colour, mineral texture, small breaks, areas of wear, and variations in preservation are expected features of an authentic fossil rather than manufacturing defects. They reflect burial, mineralisation, rock formation, uplift, and weathering over immense geological time. No two ammonites preserve exactly the same combination of detail.
The multiple photographs show this exact Valdedorsella akuschaensis specimen from useful angles. They allow close inspection of its condition, coiling, ornament, matrix, proportions, and display qualities. Full sizing is shown in the photographs, which provide the clearest scale information for this individual fossil. The images are not stock photographs and do not represent a similar item.
Certificate of Authenticity
This genuine fossil includes a generic Certificate of Authenticity card with a lifetime guarantee. Its Barremian age, detailed ammonite identity, and French provenance make it an appealing addition to a fossil cabinet, study collection, office display, or educational setting. It is also a thoughtful gift for anyone interested in French fossils, Lower Cretaceous geology, ammonite evolution, Tethyan palaeontology, or authentic natural history specimens.
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