Rare Peronoceras subarmata Fossil Ammonite Jurassic Lower Toarcian Robin Hood’s Bay UK

Description

Rare Peronoceras subarmata Fossil Ammonite from Robin Hood’s Bay, Yorkshire

This listing is for a rare Peronoceras subarmata fossil ammonite, dating to the Lower Toarcian stage of the Jurassic period. Discovered at the famous fossil locality of Robin Hood’s Bay, North Yorkshire, this specimen represents one of the more unusual and highly prized ammonites from the Early Jurassic seas of Britain. The fossil shown in the photographs is the exact piece you will receive, with a 1 cm scale cube included for accurate sizing. All our fossils are guaranteed 100% genuine and are supplied with a Certificate of Authenticity.

Geological Setting – Lower Toarcian, Jurassic

This ammonite originates from the Lower Toarcian stage of the Early Jurassic, approximately 182–174 million years ago. At this time, the Yorkshire coast was part of a shallow epicontinental sea that extended across much of Europe. The region is today world-renowned for its fossiliferous shales and mudstones, which form part of the Whitby Mudstone Formation.

Robin Hood’s Bay is one of the most famous fossil localities in Britain, renowned for its ammonites, belemnites, bivalves, and marine reptiles. The preservation of ammonites from this locality is exceptional, with many species showing fine ribbing, tubercles, and distinctive whorl profiles that allow precise identification.

Species and Taxonomy

• Genus: Peronoceras
• Species: subarmata
• Order: Ammonitida
• Superfamily: Hildoceratoidea
• Family: Hildoceratidae

Peronoceras subarmata belongs to the Hildoceratidae, a family of ammonites well known for their strongly ribbed and sometimes tuberculate shells. This group flourished in the Toarcian seas, and their widespread distribution has made them particularly valuable in Jurassic biostratigraphy.

Morphological Features

The Peronoceras subarmata ammonite is distinctive for its bold and striking features:

• Shell form: Typically evolute, with inner whorls exposed.
• Ribbing: Strong, radiating ribs that are often reinforced with small tubercles or nodules.
• Whorl shape: Broad and rounded, giving the fossil a robust appearance.
• Ornamentation: The ribbing and occasional tuberculation make this ammonite particularly attractive as a collector’s piece.

These morphological features make Peronoceras subarmata instantly recognisable and highly desirable among fossil collectors.

Stratigraphic and Biozone Significance

Peronoceras subarmata is characteristic of the Peronoceras subarmatum Biozone, a subdivision of the Lower Toarcian. Its presence is important in refining the stratigraphy of Jurassic deposits, serving as a biostratigraphic marker fossil. This association increases its scientific value, making specimens from Robin Hood’s Bay especially significant for both research and collecting.

Collector and Scientific Value

This ammonite holds great significance in both private and academic contexts:

• Collectors appreciate it for its rarity and distinctive ribbed morphology.
• Scientists and educators use it as a key species for identifying and dating Jurassic strata.
• For display, its aesthetic ribbing and robust shell form make it an eye-catching specimen that stands out in any fossil collection.

Authenticity and Guarantee

All of our fossils are 100% genuine specimens, responsibly sourced and carefully prepared. This Peronoceras subarmata ammonite has been selected for its rarity, quality, and scientific importance. It comes with a Certificate of Authenticity, ensuring confidence in its provenance and authenticity.

Key Information at a Glance

• Fossil Type: Ammonite
• Species: Peronoceras subarmata
• Age: Lower Toarcian, Jurassic (~182–174 million years old)
• Locality: Robin Hood’s Bay, North Yorkshire, United Kingdom
• Family: Hildoceratidae
• Order: Ammonitida
• Condition: Natural fossil with strong ribbing and excellent preservation
• Authenticity: Guaranteed with Certificate of Authenticity

This rare Peronoceras subarmata ammonite fossil from Robin Hood’s Bay is a scientifically important and visually striking specimen, perfect for serious collectors, educators, and anyone fascinated by the rich fossil heritage of the Jurassic seas.