Description
Authentic Jurassic Ammonite Fossil
This listing is for a genuine Maconiceras vigocense Ammonite Fossil from the Lower Toarcian Stage of the Early Jurassic period, discovered at West Bay, Dorset, United Kingdom. Ammonites are extinct marine molluscs within the subclass Ammonoidea and order Ammonitida, closely related to squid and octopus. Their chambered, coiled shells are among the most iconic fossils, highly prized for both their scientific value and natural beauty. This specimen has been carefully chosen for its preservation and character, with photographs showing the exact fossil you will receive. A scale cube with 1 cm squares is included for accurate sizing.
Geological Background – Lower Toarcian, Jurassic
The Lower Toarcian, dating to around 182 million years ago, represents a fascinating interval in the Early Jurassic. West Bay, Dorset, lies within the world-famous Jurassic Coast UNESCO World Heritage Site, renowned for its continuous exposure of Jurassic marine strata. These rocks were deposited in shallow epicontinental seas rich with ammonites, belemnites, marine reptiles, and other invertebrates. The Lower Toarcian is particularly notable for the Early Toarcian Oceanic Anoxic Event, which drastically altered marine ecosystems and contributed to the exceptional fossil record seen in Dorset today.
Fossils from this region are of great importance for both collectors and researchers, as ammonite faunas from the Toarcian are used extensively in stratigraphy to define precise biozones across Europe.
Species Profile – Maconiceras vigocense
The species Maconiceras vigocense belongs to the family Hildoceratidae within the superfamily Hildoceratoidea, order Ammonitida. Members of this group are noted for their compressed shells, evolute coiling, and distinct ribbing. Maconiceras species, including M. vigocense, are considered important biostratigraphic markers for the Toarcian stage.
Key identifying traits of Maconiceras vigocense include:
- A moderately evolute shell with open umbilicus, allowing inner whorls to remain visible.
- Fine, regularly spaced ribs radiating across the whorls.
- A compressed, planispiral form with elegant whorl expansion.
- Suture lines marking internal chamber divisions, displaying the intricate internal structure of the shell.
These characteristics not only make the fossil a scientifically valuable specimen but also an aesthetically striking display piece.
Paleoenvironment and Scientific Importance
During the Early Jurassic, West Bay was submerged beneath shallow marine waters where sedimentation was dominated by clays and limestones. Ammonites like Maconiceras vigocense were nektonic predators, moving actively through the water column, feeding on plankton and small marine organisms. When they died, their shells settled into the seabed, often rapidly buried by fine sediments. This process allowed their delicate features to be preserved for nearly 182 million years.
Ammonites from the Lower Toarcian are essential to defining ammonite biozones, which allow geologists to date and correlate rock sequences across different regions. This makes Maconiceras vigocense both an important research fossil and a sought-after addition for private collections.
100% Genuine with Certificate of Authenticity
All of our fossils are guaranteed 100% genuine specimens and are supplied with a Certificate of Authenticity. This ammonite fossil is an original, not a cast or reproduction, making it a true piece of Earth’s natural history.
A Perfect Collector’s Piece
This Maconiceras vigocense ammonite from West Bay, Dorset, UK is an exceptional choice for fossil collectors, geology enthusiasts, or as a unique educational display. Its geological significance, scientific importance, and natural aesthetic combine to create a specimen of real value for any collection.
Scale Rule Squares / Cube = 1 cm. Please see photos for the full sizing of this exact specimen.






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