Description
Genuine 5 1/2 Inch Belemnite Fossil
This listing is for a genuine 5 1/2 inch belemnite fossil from Blockley, Gloucestershire, UK, dating to the Pliensbachian Stage of the Jurassic Period. Belemnites are classic fossil cephalopods, closely related to modern squid and cuttlefish, and are among the most recognisable marine fossils found in British Jurassic rocks.
This fossil is a carefully chosen specimen, and the photograph shows the actual piece you will receive. Full sizing can be seen in the photo. The fossil is supplied with a Certificate of Authenticity lifetime guarantee generic card, making it an excellent addition to a fossil collection, educational display, natural history cabinet, or geology-themed gift selection.
Geology, Age and Gloucestershire Locality
This belemnite comes from Blockley, Gloucestershire, an area within the Cotswolds known for fossil-bearing Jurassic sedimentary rocks. During the Early Jurassic, this part of Britain was covered by shallow marine waters connected to wider European seas. These ancient seas supported a rich variety of marine life, including belemnites, ammonites, bivalves, brachiopods, gastropods, fish, and marine reptiles.
The fossil is Pliensbachian in age, placing it within the Early Jurassic, approximately 191 to 183 million years old. The Pliensbachian was an important time in Jurassic marine history, with widespread sea-floor sedimentation across what is now southern and central Britain. Fine muds, limestones, calcareous sediments, and shell-rich layers accumulated over time, preserving the remains of many marine organisms.
Blockley and the surrounding Gloucestershire area form part of a classic British Jurassic landscape. Fossils from this region are especially appealing because they represent marine life from a time when Britain looked very different, with warm seas covering areas that are now countryside and limestone hills.
Fossil Type and Belemnite Details
Belemnites were extinct marine cephalopods belonging to Phylum Mollusca, Class Cephalopoda, and Order Belemnitida. Unlike ammonites, which had coiled external shells, belemnites had an internal skeleton. The part most commonly preserved as a fossil is the solid, bullet-shaped guard, also known as the rostrum.
This specimen represents the durable belemnite guard, which originally formed part of the animal’s internal support and balance system. In life, the belemnite would have had a soft body, tentacles, eyes, fins, and a streamlined shape suited to active swimming. The guard helped stabilise the animal in the water and is the part most often found fossilised because it was composed of dense calcite.
Belemnite fossils are recognised by their elongated, tapering form. Depending on preservation, specimens may display natural growth lines, subtle surface texture, mineral colour variation, or calcite structure. Their distinctive shape and clear connection to ancient marine life make them popular with both beginner and experienced fossil collectors.
Jurassic Marine Environment
During the Pliensbachian, the area now known as Gloucestershire lay beneath an Early Jurassic sea filled with swimming, crawling, burrowing, and bottom-dwelling animals. Belemnites were active marine predators, likely feeding on small fish, crustaceans, and other marine organisms. They also formed part of the food chain for larger predators, including marine reptiles.
The same waters would have contained ammonites drifting and swimming through the water column, bivalves and brachiopods living on or within the seabed, and fish moving through the shallow marine environment. The fossil-bearing rocks from this period preserve a direct record of these ancient ecosystems and are highly valued for both collecting and educational use.
Collectible British Jurassic Fossil
This 5 1/2 inch belemnite fossil from Blockley, Gloucestershire is a desirable example of a genuine British Jurassic marine fossil. Its size, Pliensbachian age, UK locality, and classic cephalopod form make it an excellent display piece for collectors of fossils, belemnites, Jurassic marine life, British geology, and natural history specimens.
This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The photograph shows the actual fossil you will receive, making this a carefully selected and accurately represented piece from the Early Jurassic marine deposits of Gloucestershir
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