Oistoceras Ammonite Fossil | Lower Lias, Jurassic Coast, Dorset UK | Green Ammonite Beds | Genuine British Fossil with Certificate

This is a genuine Oistoceras ammonite fossil from the Green Ammonite Beds of the
Lower Lias Formation, collected from the iconic Jurassic Coast at Golden Cap, Seatown, Dorset, UK.

Fossil Overview:

• Species: Oistoceras sp.
• Fossil Type: Ammonite
• Location: Golden Cap, Seatown, Dorset, United Kingdom
• Stratigraphy: Green Ammonite Beds, Lower Lias Formation
• Geological Period: Early Jurassic (~190–195 million years ago)
• Stage: Upper Sinemurian
• Scale Reference: 1cm cube visible in photo
• Authenticity: Supplied with a Certificate of Authenticity
• Photo: What you see is exactly what you will receive

Scientific Classification:

• Kingdom: Animalia
• Phylum: Mollusca
• Class: Cephalopoda
• Order: Ammonitida
• Superfamily: Eoderoceratoidea
• Family: Oxynoticeratidae
• Genus: Oistoceras
• Geological Stage: Upper Sinemurian (Early Jurassic)
• Formally Described By: Haug, 1887

Geological Context:

The Lower Lias is part of the Blue Lias Group, famous for its fossil-rich marine sediments laid down during the Early Jurassic when this part of Britain was covered by a warm, shallow sea. The Green Ammonite Beds, specifically, are highly fossiliferous and are well-known among collectors and geologists for preserving a variety of ammonite species in exceptional detail.

This ammonite was found in situ within the shale and limestone interbeds, characteristic of rhythmic sedimentation and low-oxygen sea floor conditions that helped preserve these animals in remarkable detail.

Morphological Features:

• Typically involute shell with gently rounded whorls
• Fine, sinuous ribbing often seen extending across the flanks
• Distinct umbilicus and keel depending on preservation
• Oistoceras species are known for their delicate ribbing and flattened whorls, representative of the Oxynoticeratidae family
• Preservation in iron pyrite or limestone matrix is typical of the Green Ammonite Beds

Notable Characteristics:

• From the UNESCO World Heritage Site Jurassic Coast
• Excellent teaching specimen or collector's display
• A representation of Early Jurassic marine life and faunal turnover
• Offers scientific and aesthetic value with excellent natural preservation
• A classic example of Sinemurian ammonite evolution

Summary:

• Genus: Oistoceras
• Age: ~190–195 million years old (Sinemurian Stage)
• Formation: Lower Lias, Green Ammonite Beds
• Location: Golden Cap, Seatown, Dorset, UK
• Certificate: Included with purchase
• Photo: Shows actual specimen
• Scale Cube: 1cm

Note:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

The specimen has been carefully selected for its quality and rarity and is guaranteed to be the exact fossil you see in the photo. A perfect addition to any collection of Jurassic marine fossils.