Description
Double Harpoceras falciferum Fossil Ammonites
This is a carefully chosen double Harpoceras falciferum fossil ammonite specimen from the Beacon Limestone, Jurassic, Ilminster, United Kingdom. Featuring two ammonites together, this is an attractive and collectable British Jurassic fossil piece with strong natural history appeal. The photograph shows the actual specimen you will receive, allowing you to view the preservation, shape, surface detail, matrix, colour and overall character of the fossil before purchase.
This genuine fossil comes from the Alice Purnell Collection and includes a Certificate of Authenticity lifetime guarantee generic card. Full sizing can be seen in the photo. Double ammonite specimens are especially desirable because they display more than one fossil on the same piece, giving the specimen a natural association and excellent display value.
Geology and Jurassic Age
Harpoceras falciferum is a classic Early Jurassic ammonite species, particularly associated with the Lower Toarcian stage, approximately 183 million years old. The Beacon Limestone of the Ilminster area in Somerset is well known for Jurassic marine fossils and represents ancient seabed deposits from a time when much of southern Britain was covered by shallow to moderately deep seas.
During the Jurassic Period, the region now known as Ilminster was part of a marine environment inhabited by ammonites, belemnites, bivalves, brachiopods, crinoids, fish and marine reptiles. Sediments accumulated on the sea floor, burying shells and hard parts that later became fossilised through mineral replacement, compaction and geological time. Fossils from the Beacon Limestone are popular with collectors because they combine classic British locality interest with attractive ammonite preservation.
Fossil Type and Species
This specimen contains fossil ammonites, extinct marine cephalopods related to modern squid, cuttlefish and nautilus. Ammonites lived inside coiled, chambered shells. The living animal occupied the outer body chamber, while the earlier chambers helped control buoyancy, allowing it to move through the Jurassic sea.
Species: Harpoceras falciferum
Genus: Harpoceras
Family: Hildoceratidae
Superfamily: Hildoceratoidea
Order: Ammonitida
Class: Cephalopoda
Phylum: Mollusca
Harpoceras falciferum is one of the most recognisable Toarcian ammonites and is widely valued by collectors for its elegant, compressed shell form and distinctive curved ribbing. The species is also important in Jurassic biostratigraphy, with the Falciferum Zone being a well-known Lower Toarcian ammonite biozone used in the dating and correlation of marine Jurassic rocks.
Morphology and Display Features
Harpoceras falciferum is admired for its flattened, planispiral shell and graceful falcate ribs. The ribs curve across the shell in a swept pattern, giving the ammonite a refined and dynamic appearance. This ornamentation is one of the most attractive features of the species and helps distinguish it from many other Jurassic ammonites.
The ammonite shell form records the growth of the animal through life, with each whorl representing a new stage of development. The coiled shape provided strength and buoyancy control while creating the iconic spiral form that makes ammonites among the most collectable fossils in the world. A double specimen adds further interest, as the two ammonites create a more visually engaging display and represent multiple individuals preserved from the same ancient marine setting.
Ilminster and the Beacon Limestone
Ilminster, Somerset, is a respected British fossil locality known for Jurassic marine fossils from the Beacon Limestone. These deposits preserve evidence of ancient seas that once covered southwest England. Ammonites from this region are particularly sought after because they show both geological importance and strong display appeal.
The Beacon Limestone formed from marine sediments deposited in Jurassic seas. Shells from ammonites and other organisms could settle on the seabed after death, become buried, and eventually fossilise within the surrounding rock. The resulting fossils provide a direct link to the marine ecosystems of Early Jurassic Britain and are ideal for educational collections, fossil cabinets and natural history displays.
Authenticity and Collector Appeal
This double Harpoceras falciferum ammonite fossil is a genuine specimen from the Alice Purnell Collection and includes a Certificate of Authenticity lifetime guarantee generic card. The photograph shows the exact fossil supplied, so the buyer can clearly assess the actual specimen before purchase.
As with all genuine fossils, natural cracks, matrix, mineralisation, surface marks, preparation marks, colour variation and age-related wear may be present. These features are normal characteristics of authentic fossils and form part of the specimen’s geological history. This double Harpoceras falciferum from the Beacon Limestone, Ilminster, is an excellent choice for collectors of British fossils, Jurassic ammonites, named species specimens, natural history pieces and display-quality fossil ammonite examples.
