Description
Genuine British Echinoid Fossil
This carefully selected Holaster gregoryi echinoid fossil is a genuine fossil sea urchin from the Chalk Group of Beachy Head, East Sussex, UK. It dates to the Cenomanian Stage of the Upper Cretaceous Period, making it approximately 94–101 million years old. The Cenomanian represents the earliest stage of the Late Cretaceous and was a time when extensive warm seas covered much of southern Britain.
The photographs show the actual fossil specimen you will receive, rather than a representative example. Natural differences in preservation, colour, chalk matrix, texture and surface detail are part of the specimen’s geological character. For the full dimensions and scale of this individual fossil, please refer carefully to the sizing photograph.
Fossil Species and Classification
Species: Holaster gregoryi
Fossil type: Irregular echinoid or fossil sea urchin
Phylum: Echinodermata
Class: Echinoidea
Geological group: Chalk Group
Geological period: Cretaceous
Epoch: Late Cretaceous
Stage: Cenomanian
Locality: Beachy Head, East Sussex, United Kingdom
Echinoids belong to the echinoderms, a group of exclusively marine animals that also includes starfish, brittle stars and crinoids. Unlike the nearly circular, radially symmetrical tests of many regular sea urchins, irregular echinoids developed a more distinctly bilateral body plan adapted to life on or within soft seabed sediment.
Morphology and Natural Features
Holaster gregoryi possessed a rigid shell, correctly known as a test, constructed from interlocking calcite plates. Its body form was characteristically heart-like to suboval, with a defined front and rear rather than the evenly rounded outline associated with modern regular sea urchins.
The upper surface carried petaloid ambulacral areas containing rows of pores through which the tube feet once extended. These structures assisted with respiration, movement and interaction with the surrounding sediment. The mouth was positioned on the underside of the animal, while the rearward position of the anal opening reflects the directional movement and specialised lifestyle of irregular echinoids.
Depending on preservation, this specimen may display portions of the test outline, ambulacral pattern, plate boundaries, pore pairs, natural chalk infill or weathered surface textures. These authentic features were formed through a combination of the animal’s original anatomy, burial, mineralisation and millions of years of geological alteration.
Chalk Group Geology
The Chalk Group is dominated by fine-grained, pale limestone formed largely from microscopic calcium-carbonate remains that accumulated on an ancient seabed. These sediments were deposited in an extensive marine environment across southern and eastern England. Beachy Head provides an internationally recognisable exposure of this Upper Cretaceous chalk succession, with its coastal cliffs preserving millions of years of geological history.
During the Cenomanian, southern Britain lay beneath a warm sea supporting a diverse ecosystem of echinoids, ammonites, brachiopods, bivalves, sponges and other marine organisms. Holaster gregoryi was a benthic animal associated with the seafloor, where irregular echinoids were adapted for moving across or burrowing into soft carbonate sediment.
After death, the echinoid became buried within calcareous seabed material. Over immense spans of time, the surrounding sediment compacted and lithified into chalk, preserving the test as a fossil and creating the specimen available today.
Collector’s Specimen and Display Piece
This authentic British fossil is suitable for an echinoid collection, Cretaceous fossil display, geology cabinet, educational collection or natural-history gift. Its combination of identified species, classic Chalk Group preservation and documented East Sussex locality gives it particular appeal to collectors of British fossils and prehistoric marine life.
The specimen has been individually chosen for its natural character and collectable qualities. As a genuine geological object, it may include small chips, cracks, chalk deposits, weathering, irregular edges or areas of incomplete preservation. These are normal characteristics of fossils and should not be regarded as manufacturing faults.
Certificate of Authenticity
The fossil includes a generic Certificate of Authenticity card with a lifetime guarantee, confirming that it is a genuine fossil specimen. The supplied card provides lasting reassurance for collectors, gift recipients and educational use.
You will receive the exact Holaster gregoryi echinoid fossil pictured. Please examine every photograph for condition, preservation, colour, matrix and complete sizing information before purchase.
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