Description
Genuine Sonninia gigensis Ammonite Fossil
This listing is for a genuine Sonninia gigensis ammonite fossil from the Inferior Oolite Group at Redhole Lane, East Sherborne, Dorset, UK. It dates to the Middle Jurassic, Bajocian stage, specifically the Laeviuscula Subzone, making it a highly collectable British Jurassic ammonite with excellent geological interest. This carefully chosen fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card.
The fossil shown in the photograph is the actual specimen you will receive, so you can buy with confidence knowing the piece pictured is the piece supplied. Full sizing details can be seen in the photo. This specimen is ideal for collectors of British fossils, Jurassic ammonites, Dorset fossils, Inferior Oolite specimens, natural history displays, and educational geology collections.
Species and Fossil Type
Sonninia gigensis is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites possessed coiled, chambered shells, with the living animal occupying the outer body chamber while the internal chambers helped regulate buoyancy. Their shells are among the most recognisable fossils from the Jurassic seas and are especially valued for their scientific importance and attractive spiral form.
The genus Sonninia is a classic Bajocian ammonite group and is often associated with well-developed ribbing, a compressed to moderately inflated shell form, and a distinctively ornamented appearance. Sonniniid ammonites are important in Middle Jurassic biostratigraphy because their evolution and distribution help geologists correlate Bajocian rock layers across different regions.
Bajocian Age and Laeviuscula Subzone
This fossil comes from the Bajocian stage of the Middle Jurassic Period, a time when warm, shallow seas covered much of what is now southern England. The Laeviuscula Subzone is part of the detailed ammonite zonation used to divide and understand Bajocian marine strata. Ammonite zones and subzones are especially useful because ammonites evolved rapidly, spread widely through ancient seas, and are often preserved in marine sedimentary rocks.
During the Bajocian, the seas around Dorset supported a rich marine ecosystem. Ammonites such as Sonninia swam or drifted through the water column alongside belemnites, bivalves, brachiopods, gastropods, echinoids, crinoids, fish, and marine reptiles. After death, ammonite shells could settle onto the sea floor, become buried in sediment, and gradually fossilise over millions of years.
Inferior Oolite Group Geology
This specimen is from the Inferior Oolite Group, one of southern England’s most famous Middle Jurassic fossil-bearing rock units. The Inferior Oolite is known for fossiliferous limestones and related shallow marine sediments that preserve a wide variety of invertebrate fossils. These deposits record ancient sea-floor environments, changes in water depth, sediment movement, and the development of rich marine communities during the Jurassic.
Fossils from the Inferior Oolite are popular with collectors because they combine attractive preservation with strong scientific and regional significance. Ammonites from this group are particularly desirable, as they provide a direct link to the warm Jurassic seas that once covered large parts of Dorset and the surrounding region.
Redhole Lane, East Sherborne Locality
Redhole Lane at East Sherborne in Dorset is a notable locality for Middle Jurassic fossils, including ammonites from the Inferior Oolite Group. Fossils from this area are sought after by collectors of classic British Jurassic material due to their provenance, age, and connection with the fossil-rich geology of Dorset.
The locality adds strong appeal to this specimen, especially for collectors who focus on named UK fossil sites, Jurassic Coast region material, or ammonites with precise stratigraphic information. The combination of species, locality, geological group, and subzone makes this Sonninia gigensis a well-documented and appealing fossil for display or study.
Morphology and Collectable Features
Sonninia ammonites are generally appreciated for their bold Jurassic character, with attractive coiling and ornamentation. Depending on preservation, specimens may display curved or branching ribs, visible whorl structure, a defined umbilicus, natural shell detail, and surrounding matrix from the original rock. These features give the fossil strong visual appeal while also preserving important evidence of shell growth and ammonite form.
As a genuine natural fossil, this specimen may show normal signs of age and preservation, including mineralisation, matrix attachment, surface texture, small chips, repairs, weathering, compression, or natural colour variation. These characteristics are typical of authentic fossils and form part of the individual character of the piece. This is not a modern replica, cast, or decorative imitation.
Provenance and Authenticity
Fossil type: Ammonite
Species: Sonninia gigensis
Age: Middle Jurassic, Bajocian
Subzone: Laeviuscula Subzone
Geological group: Inferior Oolite Group
Locality: Redhole Lane, East Sherborne, Dorset, UK
Certificate: Includes a Certificate of Authenticity lifetime guarantee generic card
Specimen shown: The photo shows the actual fossil you will receive
Size: Full sizing shown in the photo
This Sonninia gigensis ammonite fossil is a carefully selected British Jurassic natural history specimen with strong appeal for fossil collectors, geology enthusiasts, educational collections, and display cabinets. Its Bajocian age, Laeviuscula Subzone detail, Inferior Oolite origin, Dorset locality, and included Certificate of Authenticity make it a desirable addition to any collection of genuine ammonites, UK fossils, prehistoric marine life, or Middle Jurassic specimens.
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