Description
Genuine Protoacanthoceras sp. Ammonite Fossil from Balcombe Pit, Glynde
This is a genuine Protoacanthoceras sp. ammonite fossil from Balcombe Pit, Glynde, East Sussex, UK, dating to the Middle Cenomanian Stage of the Upper Cretaceous. This carefully chosen fossil represents an authentic marine cephalopod from the ancient chalk seas that covered much of southern England around 95 million years ago. Fossils from the Glynde area are highly collectable because they come from a classic East Sussex Cretaceous locality with strong geological and palaeontological interest.
The photograph shows the actual fossil specimen you will receive. Full sizing can be seen in the photo. This fossil also includes a Certificate of Authenticity lifetime guarantee generic card, making it suitable for fossil collectors, chalk fossil enthusiasts, educational geology collections, natural history displays, and collectors of genuine British Cretaceous ammonites.
Fossil Type and Identification
Protoacanthoceras sp. 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 outer body chamber, while the earlier internal chambers helped regulate buoyancy, allowing it to move through the water column of the Cretaceous sea.
The genus Protoacanthoceras belongs to the order Ammonitida and is associated with the family Acanthoceratidae, an important group of Cretaceous ammonites known for strong ribbing, ornamented shell forms, and in many species, raised tubercles or nodular features. These bold shell characteristics make acanthoceratid ammonites especially desirable to collectors and useful to palaeontologists studying Cretaceous marine strata.
As this fossil is identified as Protoacanthoceras sp., it has been confidently assigned to the genus, while the exact species has not been specified. This is common with fossil ammonites where preservation, matrix, natural wear, compression, or partial exposure may limit species-level identification. The genus itself remains highly collectable and scientifically meaningful, especially when paired with a clear locality and geological age.
Middle Cenomanian Upper Cretaceous Age
This ammonite dates to the Middle Cenomanian, an important interval within the early part of the Upper Cretaceous Period. The Cenomanian was a time of high global sea levels, warm climates, and widespread marine environments across Europe. During this stage, southern Britain lay beneath a warm epicontinental sea, where carbonate-rich sediments accumulated on the sea floor and later became part of the famous chalk succession.
Ammonites such as Protoacanthoceras are especially important in Cretaceous geology because they evolved rapidly and were widely distributed across ancient seaways. Their distinctive shell forms help geologists date and correlate chalk, marl, limestone, and other marine deposits. A Middle Cenomanian ammonite from East Sussex therefore represents both an attractive fossil specimen and a useful marker of a specific interval in Earth history.
Balcombe Pit, Glynde Geological Setting
Balcombe Pit at Glynde in East Sussex is associated with the fossil-bearing Upper Cretaceous deposits of southern England. The Glynde area lies within the classic chalk landscape of East Sussex, where ancient marine sediments now form part of the geological heritage of the South Downs region. These deposits preserve evidence of the chalk sea, a warm marine environment rich in planktonic carbonate sediment and diverse marine life.
The Middle Cenomanian sea supported ammonites, nautiloids, bivalves, brachiopods, echinoids, sponges, fish, and marine reptiles. Ammonites moved through the water as active cephalopods, while shells that settled onto the sea floor could become buried in chalky or marly sediment and preserved over millions of years. Natural matrix, mineral staining, chalky texture, shell wear, compression, and small surface marks are all part of the fossil’s authentic geological character.
Morphology and Display Features
Protoacanthoceras ammonites are known for their robust Cretaceous appearance. The shell is planispirally coiled, forming the classic flat spiral associated with ammonites. Depending on preservation, this fossil may show strong ribs, whorl curvature, shell ornament, raised tubercles, chamber structure, natural matrix, and mineralised surface texture.
The ribs and tuberculate ornament of acanthoceratid ammonites give them a sculptural quality that makes them stand out from smoother ammonite groups. These features helped strengthen the shell and are important identification traits. The visible spiral form records the growth of the ammonite during life, while the preserved surface details reflect both the original shell and the geological processes that transformed it into a fossil.
Certificate of Authenticity Included
This Protoacanthoceras sp. ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. It has been selected as an individual fossil, with the photograph showing the exact specimen supplied rather than a stock image.
With its Middle Cenomanian age, Balcombe Pit, Glynde, East Sussex locality, and classic Protoacanthoceras identification, this fossil is an excellent addition to any collection of British fossils, Upper Cretaceous ammonites, chalk fossils, marine cephalopods, or authentic prehistoric natural history specimens.
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