Description
Genuine Leioceras sp. Ammonite Fossil
This listing is for a genuine Leioceras sp. ammonite fossil from the Dogger Formation, Middle Jurassic, Aalenian Stage, Holderness Coast, East Yorkshire, UK. This carefully chosen fossil specimen represents an extinct marine cephalopod from the Jurassic seas that once covered parts of what is now northern England. The photograph shows the actual fossil you will receive, so please refer to the image for full sizing, shape, preservation, colour, surface detail, and overall display character.
Leioceras ammonites are highly collectible Jurassic fossils, particularly for those interested in British ammonites, Middle Jurassic palaeontology, Yorkshire fossils, and classic marine invertebrate specimens. This example offers strong geological interest, a recognised fossil locality, and the timeless spiral form that makes ammonites one of the most popular fossil groups for collectors.
Fossil Type and Species Information
Leioceras is an extinct genus of ammonite, a group of marine molluscs related to modern squid, cuttlefish, octopus, and nautilus. Ammonites lived within coiled, chambered shells, with the animal occupying the outer body chamber while the inner chambers helped regulate buoyancy in the water column.
This specimen is identified as Leioceras sp., meaning it is assigned to the genus Leioceras, with the exact species left open. Leioceras is especially associated with the Aalenian Stage of the Middle Jurassic and is an important ammonite genus for dating and correlating rocks of this age. The genus is generally known for a compressed, planispiral shell form, often with a relatively smooth or finely ornamented outer surface compared with more heavily ribbed ammonites.
Depending on preservation, Leioceras specimens may show the curved whorl profile, inner coil, shell contour, growth lines, subtle ribbing, suture traces, mineral colouration, or matrix contact. These features give the fossil both scientific and display appeal.
Geological Formation and Age
This fossil comes from the Dogger Formation and dates to the Aalenian Stage of the Middle Jurassic. The Aalenian represents an important interval of Jurassic time, approximately 174 to 170 million years old. During this period, marine conditions covered large areas of what is now the United Kingdom, allowing ammonites and other sea life to flourish.
The Dogger Formation is a notable British Jurassic rock unit, often associated with iron-rich sedimentary deposits, marine beds, and fossil-bearing horizons. These sediments were laid down in ancient shallow marine environments, where shells and other remains could become buried and preserved over immense spans of geological time. Fossils from this formation are valued by collectors because they represent a distinctive part of Britain’s Middle Jurassic record.
Holderness Coast, East Yorkshire Locality
The Holderness Coast of East Yorkshire is a fascinating source of British fossil material, with geological links to the wider Yorkshire Jurassic succession. Fossils from this region are appealing to collectors because they combine UK locality interest with genuine scientific value and natural display character.
A Leioceras ammonite from the Holderness Coast is a strong addition to a collection focused on British Jurassic fossils, Yorkshire palaeontology, ammonite evolution, or marine cephalopods. The locality information gives the specimen important context, connecting it to the ancient marine environments that shaped the Jurassic geology of northern England.
Morphology and Natural Preservation
This Leioceras ammonite displays the classic coiled shell geometry that makes ammonites instantly recognisable. The planispiral form reflects the animal’s chambered shell, with successive whorls growing around a central coil. Leioceras is often admired for its refined shape and comparatively clean shell profile, making it a desirable genus for collectors who appreciate elegant ammonite morphology.
As a genuine fossil specimen, natural features may include small cracks, mineral staining, surface texture, worn edges, matrix marks, partial shell preservation, colour variation, or areas of compression. These are normal characteristics of authentic fossils and form part of the individual character of the specimen. The fossil has been selected as a display-worthy piece, suitable for close inspection, cabinet presentation, and educational use.
Collecting, Display and Gift Appeal
This Leioceras sp. ammonite fossil is ideal for a fossil cabinet, collector’s shelf, study, office, classroom, natural history display, museum-style arrangement, or geology-themed collection. Its Middle Jurassic age, Aalenian stage, Dogger Formation provenance, and East Yorkshire locality make it especially attractive to collectors of British fossils.
It would make a thoughtful gift for fossil collectors, ammonite enthusiasts, geology students, teachers, natural history fans, coastal fossil hunters, or anyone interested in prehistoric marine life. The specimen is well suited to buyers searching for genuine ammonite fossils, Yorkshire fossils, Middle Jurassic fossils, Aalenian ammonites, Dogger Formation fossils, and UK fossil display specimens.
Authenticity and Certificate
This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The included certificate provides reassurance that the item supplied is an authentic fossil specimen selected for collecting, study, display, and gifting.
The photograph shows the actual Leioceras sp. ammonite fossil you will receive. Please view the image carefully for full sizing, fossil detail, colour, preservation, natural features, and overall display quality.
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