Description
Genuine Platyceras haliotis Fossil Gastropod
This carefully chosen fossil is a genuine specimen of Platyceras haliotis, an extinct marine gastropod from the Much Wenlock Limestone Formation of Dudley in the West Midlands, UK. Dating from the Wenlock Epoch of the Silurian Period, it represents an ancient sea snail that lived approximately 430 million years ago in the warm, shallow seas that once covered the region.
The listing photograph shows the actual fossil specimen you will receive. This is not a stock photograph or a randomly selected example. Please examine the image carefully for the specimen’s complete dimensions, shape, colour, preservation, natural surface detail and any surrounding limestone matrix. Full sizing is shown in the photo.
Fossil Species and Scientific Classification
Platyceras haliotis belongs to an extinct genus of Palaeozoic gastropod molluscs. Gastropods are the diverse group containing modern marine snails, land snails, limpets and slugs, together with numerous extinct fossil forms.
Platyceras is the characteristic genus of the family Platyceratidae. These unusual gastropods are widely recognised for shells that could become cap-shaped, curved or irregularly coiled during growth. The genus was established by the American geologist and palaeontologist Timothy Abbott Conrad during the nineteenth century.
Unlike brachiopods and bivalves, which possess two separate shell valves, Platyceras had a single shell. The living animal occupied the expanding outer portion and extended its head and muscular foot through the aperture. The shell protected the animal while allowing it to remain attached to, or closely associated with, the surface on which it lived.
Distinctive Platyceras haliotis Morphology
Platyceras haliotis is notable for its relatively broad, low and asymmetrically coiled shell. The species name haliotis refers to a resemblance to Haliotis, the modern abalone genus, whose shells are similarly flattened and ear-shaped.
The earliest part of the shell may form a small curved apex, while later growth produces a wider and more expanded body whorl. The aperture can become broad and irregular, sometimes reflecting the shape of the surface beneath the animal. Growth lines may be visible across the shell, recording successive additions of shell material throughout its life.
Platyceratid gastropods are especially interesting because many members of the group lived in close association with echinoderms, particularly crinoids. Some specimens have been found attached to the calyx or feeding structures of fossil sea lilies. This relationship is generally interpreted as coprophagous or commensal, with the gastropod gaining food from waste particles or material transported by the host’s feeding currents.
The exact appearance of each fossil depends on its preservation. Natural limestone matrix, shell loss, mineral replacement, surface wear, fine fractures, incomplete margins and slight distortion are genuine results of burial, fossilisation, geological exposure and preparation. These features give the specimen its individual character and are not manufacturing defects.
Much Wenlock Limestone Formation
This fossil comes from the Much Wenlock Limestone Formation, one of Britain’s most famous Silurian geological units. The formation is extensively exposed around Dudley and forms part of the classic Wenlock succession of the English Midlands.
The Much Wenlock Limestone consists largely of fossil-rich limestone formed from carbonate mud, skeletal fragments and biological debris. Some beds contain reef-like structures created by communities of corals, stromatoporoid sponges and other organisms capable of building or stabilising areas of the ancient seabed.
Other layers represent quieter areas around these biological structures, where broken shells, crinoid fragments and fine carbonate sediment accumulated. The resulting rocks preserve an exceptionally diverse marine fauna and provide a detailed record of a Silurian tropical sea.
Silurian Wenlock Age
The Wenlock is the second major epoch of the Silurian Period, following the Llandovery and preceding the Ludlow. Its name derives from Much Wenlock in Shropshire, where rocks of this age were historically studied.
During the Wenlock, the land that would eventually become Britain lay south of the equator. The climate was warm, and large areas were covered by shallow tropical to subtropical seas. These waters supported extensive marine communities dominated by invertebrate animals.
Platyceras haliotis shared this environment with brachiopods, corals, bryozoans, trilobites, crinoids, cephalopods, bivalves and other gastropods. Early jawless and primitive jawed fish also inhabited Silurian waters, although shelly invertebrates formed the most abundant and conspicuous part of the fossil record.
Ancient Dudley Marine Environment
The Wenlock sea around the area now occupied by Dudley contained a mixture of reef, reef-margin and open seabed habitats. Corals and stromatoporoids created raised structures that provided shelter, feeding surfaces and attachment points for many organisms.
Crinoids, often called sea lilies, were especially abundant. Although they resemble plants, crinoids are echinoderm animals related to modern starfish and sea urchins. They possessed a stem, a cup-shaped body and branching arms used to collect suspended food from seawater.
The frequent association between Platyceras and crinoids makes this gastropod an important example of ecological interaction in ancient seas. Its shell could grow against the surface of its host, producing an irregular aperture shaped by prolonged contact. Such fossils provide evidence not only of an extinct animal but also of how organisms interacted within Silurian marine communities.
Fossilisation and Preservation
After the gastropod died, its shell became incorporated into sediment on the sea floor. It may have remained near an associated crinoid or become detached and transported a short distance by currents before burial.
Layers of carbonate mud and skeletal debris gradually covered the shell. Continued accumulation compacted the sediment, while calcium-carbonate cement bound the particles together and transformed them into limestone. Mineral-rich groundwater could fill internal spaces, recrystallise the shell or produce a natural mould of its original form.
The specimen may therefore preserve original calcitic material, mineral replacement, an internal mould, an external impression or a combination of preservation styles. Its present appearance records both the anatomy of the original gastropod and the geological processes that acted upon it over hundreds of millions of years.
Dudley Fossil Locality
Dudley is internationally celebrated for its Silurian geology and exceptionally diverse fossil fauna. Limestone quarrying historically exposed extensive sections of the Much Wenlock Limestone Formation, producing numerous scientifically and historically important fossils.
The locality is particularly associated with trilobites, brachiopods, corals, crinoids and molluscs. Fossils from Dudley played an important role in early British palaeontology and remain highly desirable among collectors interested in classic UK fossil sites.
A Platyceras haliotis specimen with recorded species, formation, geological age and locality is particularly suitable for a documented fossil collection, museum-style display, educational reference set or specialist Silurian cabinet.
Actual Specimen and Certificate of Authenticity
You will receive the exact Platyceras haliotis fossil gastropod shown in the listing photograph. The specimen has been individually selected for its natural form, palaeontological interest, historic British locality and collectable character.
This genuine fossil includes a generic Certificate of Authenticity card supported by a lifetime authenticity guarantee. It is an authentic prehistoric specimen rather than a cast, replica or artificially manufactured reproduction.
This Silurian gastropod makes an excellent addition to a British fossil collection, Dudley fossil display, Palaeozoic mollusc collection, geology cabinet or educational reference set. It is also a distinctive natural history gift for a fossil collector, palaeontology student, geology enthusiast, teacher or anyone fascinated by prehistoric marine life.
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