Description
Dimorphinites cf. dimorphum Ammonite Fossil from Horn Park, Dorset
This genuine Dimorphinites cf. dimorphum ammonite fossil comes from the Inferior Oolite Group at Horn Park, Dorset, UK, and dates to the Upper Bajocian Stage of the Middle Jurassic. It is a carefully chosen fossil specimen, supplied with a Certificate of Authenticity lifetime guarantee generic card. Full sizing can be seen in the photo, and the image shows the actual fossil specimen you will receive.
Dimorphinites ammonites are collectable Middle Jurassic fossils, valued for their scientific interest, classic British locality and association with the fossil-rich Inferior Oolite deposits of Dorset. This specimen is especially suitable for collectors of UK ammonites, Dorset fossils, Bajocian fossils, Inferior Oolite specimens and natural history display pieces.
Species and Scientific Interest
Dimorphinites cf. dimorphum is an extinct ammonite belonging to the ammonoid cephalopods, a group of marine molluscs related to modern squid, cuttlefish and nautilus. Ammonites lived in ancient seas and produced coiled, chambered shells. The living animal occupied the outer body chamber, while the earlier internal chambers helped regulate buoyancy as it moved through the water column.
The “cf.” in Dimorphinites cf. dimorphum means the specimen compares closely with Dimorphinites dimorphum, while allowing careful scientific caution in the exact species-level identification. This is a standard palaeontological notation used when a fossil shows strong similarity to a named species but is best labelled conservatively.
Dimorphinites is associated with Middle Jurassic ammonite faunas and is of particular interest because its name reflects variation in shell form. Ammonite shell shape, whorl section, ribbing and ornamentation are all important features used by palaeontologists when identifying species and understanding evolutionary relationships. Fossils such as this are valued not only for their display appeal, but also for their role in interpreting Jurassic marine environments.
Inferior Oolite Group and Upper Bajocian Geology
This fossil dates to the Upper Bajocian, part of the Middle Jurassic, approximately 168 million years old. During this time, southern Britain was covered by warm, shallow marine environments. These seas supported a rich ecosystem of ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, corals and other marine organisms.
The Inferior Oolite Group is one of the classic fossil-bearing Jurassic rock units of southern England. It consists of limestones, oolitic sediments, marls, sands and shelly beds deposited in shallow marine conditions. The term “oolite” refers to small rounded carbonate grains that formed in agitated warm marine water before becoming part of the limestone.
Ammonites from the Inferior Oolite are particularly important in palaeontology because they are used for biostratigraphy. Their rapid evolution and distinctive shell features allow geologists to divide the rock sequence into zones and correlate deposits between different localities. A specimen such as Dimorphinites cf. dimorphum therefore has both collecting appeal and geological significance.
Locality: Horn Park, Dorset, UK
Horn Park is a well-known Dorset locality for Middle Jurassic fossils from the Inferior Oolite Group. The area has produced a variety of ammonites and other marine fossils, making it an important site for collectors interested in Bajocian faunas and British Jurassic stratigraphy. Specimens from Horn Park are desirable because they carry clear locality information from a recognised fossil-bearing deposit.
Dorset is internationally known for its Jurassic fossil heritage, and inland Inferior Oolite localities such as Horn Park represent an important part of the county’s palaeontological record. A labelled ammonite from Horn Park is a strong addition to any British fossil collection, especially one focused on Dorset fossils, Middle Jurassic ammonites or classic UK geology.
Morphology and Display Features
Dimorphinites ammonites typically show the coiled planispiral shell form characteristic of ammonites, with visible whorls and natural shell ornamentation. Depending on preservation, this specimen may display ribbing, whorl detail, growth features, natural surface texture and subtle variation in shell profile. These details are part of the fossil’s original biological structure and help give the specimen its scientific and visual interest.
Natural colours may include cream, beige, grey, brown or iron-rich tones, influenced by the sediment and mineral conditions during fossilisation. Variations in matrix, rib definition, colour, texture and preservation are part of the fossil’s authentic geological character. As the photo shows the actual fossil you will receive, this is an individual specimen rather than a generic stock example.
Authenticity and Collector Appeal
This Dimorphinites cf. dimorphum ammonite is a genuine Upper Bajocian Middle Jurassic fossil from the Inferior Oolite Group at Horn Park, Dorset, UK. It includes a Certificate of Authenticity lifetime guarantee generic card, giving confidence to fossil collectors, geology enthusiasts, students and gift buyers.
With its careful scientific labelling, British locality, Inferior Oolite provenance and Middle Jurassic age, this fossil would make an excellent addition to a Jurassic fossil collection, Dorset ammonite display, educational geology cabinet, natural history collection or specialist British fossil suite.
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