Description
Genuine Pseudolioceras Ammonite Fossil
This is a genuine Pseudolioceras pseudogrammoceras ammonite fossil from Ravenscar, North Yorkshire, UK. It comes from the Ravenscar Group and dates to the Toarcian stage of the Lower Jurassic. The photographs show the actual carefully chosen specimen you will receive, so its natural preservation, colour, matrix and visible fossil detail can be assessed before purchase. Please refer to the photographs for full sizing and scale.
Lower Jurassic Toarcian Geology
The Toarcian Age formed the final part of the Early Jurassic and lasted from approximately 182 to 174 million years ago. At that time, the area that is now northern England experienced changing coastal and marine conditions. Sediments were laid down in environments ranging from shallow seas to deltas, lagoons, coastal plains and river-influenced settings. These deposits preserve an important record of environmental change during a dynamic interval of Jurassic history.
The Ravenscar Group
The Ravenscar Group is a celebrated Lower to Middle Jurassic rock succession exposed along the North Yorkshire coast. Its alternating sandstones, mudstones, siltstones, ironstones and occasional coal-bearing layers reveal repeated changes in sea level and sediment supply. Marine intervals within this wider coastal succession can contain ammonites and other sea life. Fossils help geologists recognise the age of individual layers and connect the Yorkshire sequence with equivalent Jurassic rocks elsewhere in Britain and Europe.
Ravenscar itself gives its name to this geological group and lies within one of the United Kingdom’s most significant Jurassic landscapes. Natural erosion of cliffs and foreshore exposures continually reveals evidence of ancient habitats. Fossil collecting from such material provides a direct connection with the seas and coastal environments that occupied Yorkshire long before the present landscape formed.
Pseudolioceras pseudogrammoceras
Pseudolioceras is an extinct ammonite genus within the order Ammonitida. Ammonites were marine cephalopods related to living squid, octopus and nautilus. They carried coiled, chambered shells. The animal occupied the final body chamber, while sealed earlier chambers assisted with buoyancy. Species of Pseudolioceras are associated with Toarcian marine strata and are useful elements of Jurassic biostratigraphy because ammonite lineages changed comparatively quickly and were distributed across broad marine areas.
Pseudolioceras pseudogrammoceras is identified through a combination of shell form and ornament. Palaeontologists examine features including the degree of coiling, whorl proportions, umbilical width, ribbing and the shape of the outer shell margin. Fossil preservation varies naturally. A specimen may retain shell material, mineral replacement, an impression, or an internal mould formed when sediment entered the shell. Matrix, small fractures, worn areas and surface irregularities are part of the fossil’s geological history rather than artificial defects.
Actual Specimen and Display Value
The exact fossil pictured will be supplied. Its association with the Toarcian Ravenscar Group makes it suitable for a British fossil collection, a geological teaching display, a natural-history cabinet or a distinctive palaeontology gift. It records an extinct marine animal and also helps illustrate the varied environments preserved in the Yorkshire Jurassic succession.
Certificate of Authenticity
This fossil includes a generic Certificate of Authenticity card with a lifetime guarantee of authenticity. Handle the specimen carefully and avoid soaking, harsh chemicals, excessive humidity and sudden temperature changes. A stable display support will help protect natural edges and any exposed shell detail while allowing the ammonite to be appreciated from the angle shown in the photographs.
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