Description
Genuine Promicroceras marstonense Fossil Ammonite Multi Block from Marston Magna
This genuine Promicroceras marstonense fossil ammonite multi block originates from the famous Marston Marble deposits of Marston Magna, Somerset, United Kingdom. Dating to the Lower Jurassic period within the Obtusum Zone of the Lower Lias, approximately 195 million years ago, this exceptional fossil block preserves multiple beautifully fossilised ammonites within the original limestone matrix.
The specimen shown in the photographs is the exact fossil you will receive. Carefully selected for its preservation, scientific importance and display quality, this authentic ammonite multi block represents one of the classic fossil assemblages from the renowned Jurassic deposits of Somerset.
This fossil includes a Certificate of Authenticity lifetime guarantee generic card confirming the specimen is 100% genuine.
Full sizing please see photo.
About Promicroceras marstonense
Promicroceras marstonense is a distinctive Lower Jurassic ammonite belonging to the order Ammonitida and the superfamily Psiloceratoidea. These extinct marine cephalopods were closely related to modern squid, octopus and nautilus and thrived within the warm shallow seas covering much of prehistoric Europe during the Early Jurassic.
The shell of Promicroceras typically displays elegant coiling with fine ribbing and compressed whorls, creating a highly attractive and recognisable ammonite form. The chambers within the shell were separated by septa and connected through a siphuncle, enabling buoyancy control while the living animal swam through Jurassic seas.
Promicroceras species are especially important within British Jurassic stratigraphy because they serve as valuable index fossils for dating Lower Lias sedimentary sequences. Their rapid evolutionary development and widespread occurrence allow geologists to identify specific biozones with great accuracy.
This multi block specimen preserves numerous individual ammonites naturally embedded within the host limestone, creating an impressive fossil assemblage representative of ancient marine life from the Early Jurassic.
Marston Marble and the Obtusum Zone
The Marston Marble of Somerset is one of Britain’s most famous ornamental fossil limestones and has been valued for centuries due to its dense concentration of beautifully preserved ammonites. Formed within the Lower Lias during the Sinemurian Stage of the Lower Jurassic, the limestone accumulated in shallow marine environments rich in cephalopod life.
The Obtusum Zone represents an important ammonite biozone within the Lower Jurassic sequence and is characterised by distinctive ammonite faunas including Promicroceras species. These fossil-rich marine sediments were deposited beneath warm shallow seas that covered much of southern England around 195 million years ago.
Periodic sediment accumulation, low oxygen conditions and rapid burial allowed large numbers of ammonites to become preserved together within limestone nodules and fossiliferous beds. The resulting stone became historically known as Marston Marble due to its highly decorative fossil content and ability to take a fine polish.
Marston Magna is internationally recognised among collectors and palaeontologists for producing classic Lower Jurassic ammonite material of exceptional quality.
Natural Fossil Preservation
This fossil retains authentic natural preservation and has not been artificially replicated or reconstructed. The visible ammonite shells, ribbing and limestone matrix formed naturally over millions of years through sedimentary burial and fossilisation.
The specimen preserves genuine shell morphology associated with Promicroceras marstonense, including coiled whorls, fine ornamentation and natural mineralisation. Variations in colour, texture and preservation are entirely natural and reflect the marine depositional environment of the Lower Jurassic seas.
Multi ammonite blocks are especially desirable because they preserve an entire fossil assemblage within the original rock matrix, offering both scientific and visual appeal.
Scientific and Collectable Importance
Promicroceras ammonites are highly important biostratigraphic fossils and play a significant role in correlating Jurassic sedimentary rocks across Europe. Their abundance and rapid evolutionary changes make them invaluable tools for geological dating and palaeoenvironmental reconstruction.
The Marston Marble deposits remain among the most iconic fossil localities in the United Kingdom and are highly prized by collectors worldwide. Multi ammonite blocks from these deposits are especially sought after due to their dense fossil concentration and historical geological significance.
This specimen is ideal for collectors of ammonites, British Jurassic fossils, Somerset fossils, marine cephalopods, Lower Lias fossils and authentic prehistoric natural history specimens.
Certificate of Authenticity
Included with the fossil is a Certificate of Authenticity lifetime guarantee generic card confirming that the specimen is genuine. The photographs provided show the exact fossil you will receive, allowing collectors and buyers to purchase with complete confidence.
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