Description
Polished Promicroceras marstonense Fossil Ammonites Multi Block – Marston Magna, Somerset, UK
This stunning polished fossil display features a multi-block cluster of Promicroceras marstonense ammonites, expertly exposed and finished in a FREEFORM sculpture style. Mined from the famed Marston Marble beds of Marston Magna, Somerset, UK, this fossil dates back to the Lower Jurassic, specifically the Obtusum Zone of the Lower Lias Group, making it over 190 million years old.
Fossil Type: Ammonite Cluster
Species: Promicroceras marstonense
Family: Oxynoticeratidae
Superfamily: Psiloceratoidea
Order: Ammonitida
Geological Stage: Lower Jurassic (Sinemurian)
Zone: Obtusum Zone
Biozone: Promicroceras marstonense Subzone
Depositional Environment: Shallow marine shelf – fine-grained carbonate mudstone (Marston Marble) formed in low-energy, offshore environments
Location: Marston Magna, Somerset, United Kingdom
Formally Identified By: Commonly attributed to S.S. Buckman, who described many Lower Jurassic ammonites in the UK
Morphology Features: Promicroceras marstonense is characterised by its small, tightly coiled planispiral shell with fine ribbing and a well-defined keel. This species typically shows 5–15 mm diameters and is frequently preserved in fine-grained carbonate-rich nodules, allowing for excellent detail and polish.
Geological Context: The Marston Marble is a renowned fossiliferous limestone from the Lower Lias Formation, rich in marine fossils from the Sinemurian Stage of the Jurassic. This particular stratum is celebrated for its preservation of micro- and macro-fauna in striking detail. The Promicroceras marstonense Subzone represents an important early Sinemurian biozone used in ammonite biostratigraphy across Europe.
Condition: Polished, FREEFORM style with visible natural surface and sectioned ammonite shells. The actual specimen you will receive is pictured. Please refer to the image for full sizing – Scale Rule Squares/Cube = 1cm.
Important Note:
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
A perfect addition to any fossil collection, geological display, or natural history décor.
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