Description
GENUINE GENTONICERAS GENTONI AMMONITE FOSSIL
This listing is for a genuine Gentoniceras gentoni ammonite fossil from the Cenomanian Stage of the Cretaceous Period, collected from Glynde, Sussex, UK. This is a carefully chosen fossil specimen, with the listing photo showing the actual fossil you will receive. It is an excellent piece for collectors of British fossils, Cretaceous ammonites, Sussex fossils, chalk fossils, marine fossils, natural history specimens, and classic UK palaeontology.
This fossil is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming that it is a genuine natural fossil specimen. Full sizing can be seen in the photo.
SPECIES AND FOSSIL TYPE
Gentoniceras gentoni is an ammonite, part of the extinct ammonoid cephalopods that lived in ancient marine environments during the Cretaceous Period. Ammonites were related to modern squid, cuttlefish, and nautilus, and lived within chambered shells that helped regulate buoyancy in the water. The living animal occupied the final body chamber, while the earlier chambers acted as a natural floatation system.
Gentoniceras is a Cretaceous ammonite genus associated with the Cenomanian seas of Europe. Ammonites of this age are highly valued by collectors because they represent an important period in the evolution of marine cephalopods and are useful fossils for understanding the age and correlation of Cretaceous marine deposits. A named Gentoniceras specimen from Sussex is especially appealing for anyone building a collection of British ammonites, chalk fossils, or fossil cephalopods.
CENOMANIAN GEOLOGICAL AGE
This specimen dates from the Cenomanian Stage, the earliest stage of the Late Cretaceous Period. During the Cenomanian, global sea levels were high and large areas of southern Britain were covered by warm, shallow marine waters. These seas formed part of a wider marine system that extended across much of Europe, creating ideal conditions for ammonites, bivalves, echinoids, sponges, fish, marine reptiles, and planktonic organisms.
The Cenomanian is an important interval in British geology because it records the transition into widespread chalk deposition across southern England. Fossils from this stage help demonstrate how marine life changed as sea levels rose and carbonate-rich sediments began to dominate the seabed. Ammonites are particularly significant because many species evolved rapidly and are widely used by geologists in biostratigraphy.
GLYNDE, SUSSEX FOSSIL LOCALITY
Glynde in Sussex is located within a region famous for Cretaceous geology and fossil-bearing chalk deposits. Sussex has long been an important area for the study of British palaeontology, with numerous exposures and historic localities preserving marine fossils from the ancient chalk seas. Fossils from this part of southern England are popular with collectors because they combine classic British locality interest with strong scientific value.
The Glynde area lies within the broader geological setting of the South Downs, where Cretaceous marine sediments record the conditions of the ancient sea that once covered the region. Fossils from Sussex chalk and related deposits provide a direct link to this prehistoric marine environment and are excellent additions to regional fossil collections.
MORPHOLOGY AND COLLECTABLE FEATURES
Gentoniceras gentoni is appreciated as a named ammonite with a classic Cretaceous shell form. Ammonite shells were coiled and divided into internal chambers by walls known as septa. The outer shell could display ribbing, growth lines, whorl shape, and other surface ornamentation that are important for identification and comparison.
Depending on preservation, Gentoniceras specimens may show curved whorl structure, natural shell ornament, ribbing, or chamber-related features. These details make ammonites particularly attractive to collectors because they reveal both the beauty and function of the shell. The compact coiled form, scientific name, and Cenomanian age make this fossil suitable for display, study, or comparison within a wider ammonite collection.
CRETACEOUS MARINE ENVIRONMENT
When this ammonite was alive, the area now known as Sussex was beneath a warm marine sea rather than dry land. Fine carbonate sediment accumulated on the seafloor, much of it derived from the microscopic remains of planktonic algae known as coccolithophores. Over millions of years, this carbonate mud compacted into the chalk deposits that are now such an important feature of southern England’s geology.
Gentoniceras gentoni would have lived as an active marine cephalopod, moving through the water column and forming part of a diverse Cretaceous food web. Its chambered shell provided buoyancy control, while the soft-bodied animal extended from the final chamber to feed and move. Fossils like this preserve a direct connection to the vanished Cretaceous seas and the marine life that flourished before the end-Cretaceous extinction.
AUTHENTICITY AND DISPLAY
This Gentoniceras gentoni ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The listing photo shows the actual fossil you will receive, so you can buy with confidence knowing the specimen pictured is the one supplied.
This fossil would make an excellent addition to a fossil cabinet, geology collection, educational display, natural history collection, or specialist ammonite collection. It is also a thoughtful gift for fossil collectors, palaeontology enthusiasts, students, teachers, or anyone interested in British fossils, Sussex geology, Cretaceous ammonites, and prehistoric marine life.
PRODUCT DETAILS
Fossil: Ammonite
Species: Gentoniceras gentoni
Age: Cenomanian, Late Cretaceous
Location: Glynde, Sussex, UK
Specimen: Genuine fossil ammonite
Certificate: Includes Certificate of Authenticity lifetime guarantee generic card
Sizing: Please see photo for full sizing
Photo: Shows the actual specimen you will receive
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