Description
This listing features a rare and exceptionally preserved 4.25-inch fossil ammonite, Echioceras raricostatum, collected from the Lower Pliensbachian Stage of the Jurassic Period at Radstock Grove Quarry, Radstock, Somerset, United Kingdom.
The specimen pictured is the exact fossil you will receive. Each cube in the scale image represents 1cm — please refer to the photo for full sizing and detail.
This is a scientifically significant, display-quality ammonite—perfect for collectors, educators, or fossil enthusiasts.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
Geological & Scientific Information:
- Fossil Type: Ammonite
- Species: Echioceras raricostatum
- Order: Ammonitida
- Superfamily: Eoderoceratoidea
- Family: Echioceratidae
- Geological Stage: Lower Pliensbachian (~190.8 – 182.7 million years ago)
- Biozone: Raricostatum Zone – this species is the index fossil for the zone
- Formation: Lower Lias Formation
- Locality: Radstock Grove Quarry, Radstock, Somerset, England, UK
- Depositional Environment: Shallow marine shelf with fine-grained, dark calcareous muds and shales typical of Early Jurassic sedimentation in the Wessex Basin
Morphology & Notable Features:
- Evolute coiling with all whorls clearly visible
- Fine, evenly spaced ribs (rarely bifurcating) that sweep across the flanks and venter
- Wide umbilicus with compressed whorl section
- Clean, classic shell form ideal for display or study
- Excellent preservation allows appreciation of detailed ribbing and suture lines
Scientific Significance:
Echioceras raricostatum is a biostratigraphically critical ammonite, as it defines the Raricostatum Zone, a key subdivision within the Lower Pliensbachian. It is widely distributed across Western Europe and is commonly used in correlation of Early Jurassic marine strata.
Formally described in 19th-century monographs, Echioceras is one of the most recognisable genera of the Lower Jurassic ammonite faunas of Britain.
Ideal For:
- Fossil and ammonite collectors
- Geological research and teaching collections
- Biostratigraphic reference sets
- Museum or educational display
What You Will Receive:
- The exact Echioceras raricostatum fossil shown in the photos
- Certificate of Authenticity
- Secure, professional packaging for safe delivery
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