Protogrammoceras occidentale Ammonite Fossil Mid Jurassic Calvados Rare Specimen | Aalenian Normandy France Collector Fossil

Description

Genuine Protogrammoceras occidentale Ammonite Fossil

This carefully selected fossil is a genuine Protogrammoceras occidentale ammonite from Calvados in Normandy, France. It dates to the Aalenian stage, the opening part of the Middle Jurassic. The photographs show the actual specimen you will receive, allowing its natural form, preservation, colour, matrix and visible fossil detail to be examined before purchase. Please refer to the photographs for full sizing and scale.

Aalenian Middle Jurassic Geology

The Aalenian Age lasted from approximately 174 to 170 million years ago. During this interval, northwestern France lay beside warm marine waters that spread across broad shelves and local basins. Mud, sand and carbonate-rich sediment accumulated on the seabed, preserving ammonites, belemnites, bivalves and many other marine organisms.

Ammonites are especially valuable for dating Jurassic marine rocks. Their lineages evolved rapidly, individual species commonly existed for limited intervals and shells could spread across wide marine regions. Palaeontologists compare characteristic ammonite assemblages to recognise biozones and correlate strata between separate localities.

Protogrammoceras occidentale

Protogrammoceras is an extinct ammonite genus within the order Ammonitida. Ammonites were marine cephalopods related to living squid, octopus and nautilus. Their coiled shells were internally divided into chambers. The animal occupied the final body chamber, while sealed earlier chambers helped control buoyancy.

Identification of Protogrammoceras species considers the degree of coiling, whorl proportions, umbilical width, ribbing and the shape of the outer shell margin. Protogrammoceras occidentale is a named form with value for understanding Jurassic ammonite faunas of western Europe. The specimen’s identification and recorded Aalenian age give it scientific interest beyond its visual appeal.

Fossil preservation varies naturally. A specimen may retain original shell material, mineral replacement, an external impression or an internal mould formed when sediment entered the shell before burial. Matrix, worn areas, fractures and irregular edges reflect fossilisation, compaction and later geological exposure. These authentic features are part of the specimen rather than manufactured defects.

Calvados and Normandy

Calvados lies within Normandy, a region renowned for Jurassic geology and fossil-bearing coastal cliffs, quarries and inland exposures. Marine rocks preserve a long record of changing environments along the ancient margins of the European landmass. Ammonites from Normandy allow French strata to be compared with equivalent successions across Britain and continental Europe.

The fossil’s Calvados provenance adds clear geographic interest. It represents an extinct cephalopod that lived in a Jurassic sea before burial protected part of its shell. Later uplift and erosion exposed the sedimentary rocks, allowing this record of ancient marine life to be recovered.

Actual Specimen for Collection or Display

You will receive the exact fossil shown in the photographs. Its named species, Aalenian age and Normandy locality make it suitable for a specialist ammonite collection, geological study, educational display, natural-history cabinet or a distinctive French fossil gift. The photographs are the definitive guide to this individual specimen’s condition and appearance.

Certificate of Authenticity

The fossil includes a generic Certificate of Authenticity card carrying a lifetime guarantee of authenticity. Handle it carefully and avoid soaking, harsh cleaning products, excessive humidity and sudden temperature changes. Display it on a stable support so natural edges, matrix and any exposed shell ornament remain protected.