Description
Pecten Fossil Scallop from the Great Oolite of Gloucestershire
This genuine Pecten sp. scallop fossil originates from the Great Oolite Group at Blockley Quarry in Gloucestershire, United Kingdom, dating to the Middle Jurassic Period during the Bathonian Stage, approximately 168–166 million years ago. Fossils from the Great Oolite are well known for preserving diverse marine invertebrates that inhabited the warm shallow seas covering much of southern Britain during the Jurassic.
Scallops belonging to the genus Pecten are part of a long evolutionary lineage of marine bivalves that first appeared in the Paleozoic and continue to thrive in modern oceans. Fossil specimens from Jurassic deposits often display beautiful shell symmetry and radiating rib patterns that make them highly attractive for collectors and educational displays.
This carefully selected specimen preserves the characteristic fan-shaped shell structure of a Jurassic scallop and represents a classic fossil from one of the most important Middle Jurassic marine formations in England.
Geological Setting of the Great Oolite Group
The fossil was recovered from sediments belonging to the Great Oolite Group, a sequence of carbonate-rich rocks deposited during the Middle Jurassic across southern and central England. These rocks formed in a warm shallow marine shelf environment, where clear tropical waters allowed carbonate sediments to accumulate on the seabed.
The Great Oolite consists primarily of limestones, shelly sands, and oolitic deposits composed of small spherical carbonate grains known as ooids. These sediments accumulated in environments similar to modern shallow tropical seas where wave and tidal activity continually reworked the sea floor.
Blockley Quarry in Gloucestershire is one of several localities within the Cotswold region where the Great Oolite is exposed and fossil marine invertebrates can be found preserved within the limestone.
Classification and Biological Background
Pecten belongs to the phylum Mollusca, class Bivalvia, and the order Pectinida, which includes scallops and related shellfish. Members of the family Pectinidae are characterised by their symmetrical, fan-shaped shells and distinctive radial ribbing.
The genus Pecten was originally described and named by the Swedish naturalist Carl Linnaeus, who recognised the distinctive morphology of scallop shells during the early development of modern biological classification.
Unlike many other bivalves that remain buried in sediment, scallops are capable of limited movement. They swim by rapidly opening and closing their valves, expelling water to propel themselves through the water column. This behaviour helps them escape predators such as starfish.
Shell Morphology and Distinctive Features
Fossil scallops belonging to the genus Pecten are recognised by their elegant shell structure and symmetrical form. Typical features include:
- Fan-shaped shell outline
- Prominent radial ribs extending from the hinge to the shell margin
- Two symmetrical valves joined by a hinge line
- Distinct “ears” or auricles near the hinge area
- Growth lines marking successive stages of shell development
These shells were composed primarily of calcium carbonate, allowing them to fossilise well within marine limestone deposits. Over millions of years, mineralisation preserved the shell structure while the surrounding sediments lithified into solid rock.
The radial ribbing provided structural strength to the shell while also helping stabilise the organism on the seabed.
Middle Jurassic Marine Environment
During the Bathonian Stage of the Middle Jurassic, much of what is now Britain was covered by a warm shallow sea connected to the vast Tethys Ocean. This marine environment supported a rich diversity of life including ammonites, belemnites, brachiopods, echinoids, crustaceans, and numerous species of bivalves.
Scallops such as Pecten inhabited sandy and shelly sea floors where they fed by filtering microscopic food particles from seawater. These bivalves played an important ecological role in marine ecosystems as both filter feeders and prey for larger marine animals.
The carbonate sediments that accumulated during this time eventually formed the limestones of the Great Oolite Group, preserving a diverse fossil assemblage that provides insight into Jurassic marine biodiversity.
Authentic Fossil Specimen
This fossil is a genuine Pecten scallop from the Great Oolite Group of Blockley Quarry, Gloucestershire, UK. The specimen has been carefully selected for quality and display appeal.
The photograph shows the actual fossil specimen you will receive, allowing collectors to clearly see the preserved scallop shell within its natural matrix.
Full sizing please see photo.
Certificate of Authenticity
This fossil includes a Certificate of Authenticity lifetime guarantee generic card, confirming that the specimen is a genuine natural fossil.
Pecten fossils from the Great Oolite are classic examples of Middle Jurassic marine life from the Cotswolds region. Their distinctive shell shape, attractive ribbing, and geological significance make them a desirable addition to any fossil collection, geological display, or educational exhibit.
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