Description
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.
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