Description
A rare and beautifully preserved 5.5-inch fossil ammonite: Amaltheus stokesi, from the Aalenian Stage of the Early Jurassic, collected near South Petherton, Somerset, United Kingdom. This species is renowned for its striking ribbing and whorl structure, making it both scientifically significant and highly collectible.
The ammonite in this listing is the exact specimen you will receive, shown clearly in photographs with a 1cm scale cube for accurate size reference. Please refer to images for full measurements and condition.
Geological & Palaeontological Information:
- Fossil Type: Ammonite
- Species: Amaltheus stokesi (formally described by Sowerby, 1815)
- Geological Period: Jurassic
- Stage: Aalenian
- Location: South Petherton, Somerset, UK
- Depositional Environment: Shallow marine setting with silty clays and limestones, part of the Upper Lias (Amaltheus Beds)
- Order: Ammonitida
- Superfamily: Eoderoceratoidea
- Family: Amaltheidae
- Biozone (Inferred): Amaltheus margaritatus Zone – a key biostratigraphic zone of the Aalenian
Morphological Features:
- Strongly ribbed, finely detailed whorls
- Planispiral shell with deep umbilicus
- Sinuous ribs crossing the venter uninterrupted
- Coiling is involute to moderately evolute depending on growth stage
- Classic shell symmetry associated with the genus Amaltheus
Notable Points:
- Amaltheus stokesi is a characteristic species of the Aalenian and widely used in ammonite zonation across Europe
- Fossils from the South Petherton area are uncommon and increasingly difficult to find in this size and condition
- An excellent specimen for collectors, researchers, or educational display
Why This Fossil is Special:
- Rare ammonite species from a historically rich UK locality
- Excellent preservation of shell form and ornamentation
- Supplied with a Certificate of Authenticity
- 100% genuine and ethically sourced specimen
- Ideal for display, stratigraphic reference, or collection
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