Description
A fine specimen of the Jurassic ammonite Cadoceras sublaev, originating from the Lower Callovian stage of the Middle Jurassic, discovered at Ashton Keynes, Wiltshire, United Kingdom. This is a well-preserved example of a classic British ammonite, with distinct morphology and geological context.
- Fossil Type: Ammonite (extinct marine cephalopod)
- Species: Cadoceras sublaev
- Size: See scale in photo (1cm cubes for accurate measurement)
- Geological Period: Jurassic
- Stage: Lower Callovian (~166–164 million years ago)
- Locality: Ashton Keynes, Wiltshire, England, UK
- Family: Cadoceratidae
- Superfamily: Stephanoceratoidea
- Order: Ammonitida
- Depositional Environment: Shallow marine, likely with fine silt and clay deposition during moderate sea level rise
Geological & Scientific Significance:
The Callovian stage marks a critical point in Jurassic ammonite evolution and marine biodiversity. Cadoceras sublaev is a well-documented taxon found within the Lower Callovian succession of the UK, particularly in the Oxford Clay Formation and equivalent strata. These ammonites are known for their moderately involute shells, smooth to finely ribbed flanks, and sometimes subtle tuberculation.
Cadoceras species are important index fossils, often used in zonal schemes across Europe. Though the exact biozone for this specimen is not specified, it may fall within the Macrocephalites gracilis Zone or associated subzones, which commonly yield Cadoceratid ammonites.
The Ashton Keynes locality lies within the traditional Oxford Clay exposure belt, a rich area for marine fossils, including cephalopods, marine reptiles, and bivalves. Fossils from this region are prized for their scientific relevance and visual quality.
Notable Features:
- Broad, rounded whorls with faint ribbing typical of Cadoceras sublaev
- Excellent shell preservation and surface texture
- Classic fossil from a historically important Oxford Clay locality
Authenticity Guaranteed: This fossil is 100% genuine and comes with a Certificate of Authenticity, ensuring scientific accuracy and verified provenance.
Photo Disclosure: You will receive the exact fossil shown in the photos. The scale cube features 1cm squares for accurate sizing reference.
Ideal for collectors, educators, or as a beautiful Jurassic display specimen, this Cadoceras sublaev ammonite is both a scientific and aesthetic addition to any fossil collection.
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