Description
An impressive and rare 10-inch fossil ammonite: Proplanulites sp., from the Lower Callovian Stage of the Middle Jurassic, collected from the renowned fossil-rich beds of Manor Farm, Wiltshire, United Kingdom. This exceptional example represents an important evolutionary stage in mid-Jurassic ammonite development, making it a desirable piece for collectors and educational display.
The specimen shown is the exact fossil you will receive, photographed with a 1cm scale cube for size reference. Please refer to the images for detailed condition and dimensions.
Geological & Palaeontological Information:
- Fossil Type: Ammonite
- Genus: Proplanulites
- Geological Period: Jurassic
- Stage: Lower Callovian (~165 to 163 million years ago)
- Location: Manor Farm, Wiltshire, England, UK
- Depositional Environment: Shallow marine shelf; fine calcareous mudstones and silts from the Oxford Clay Formation
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Kosmoceratidae
- Biozone (Inferred): Likely within the Macrocephalites herveyi or Bullatimorphites bullatus Zones of the Lower Callovian, based on stratigraphy at Manor Farm
Morphological Features:
- Moderately involute shell with smooth or weakly ribbed flanks
- Broad, rounded whorls with a flattened venter in later growth stages
- Sutures typically complex, though less ornamented than later Kosmoceratid forms
- Potential faint keel or ventrolateral tubercles in some specimens
Notable Points:
- Proplanulites is considered transitional in form, marking key ammonite evolution in the Callovian
- Manor Farm is a scientifically significant site for Jurassic marine invertebrates
- Large, display-sized examples of Proplanulites are seldom available on the fossil market
Why This Fossil is Special:
- Rare ammonite genus from a globally important stratigraphic interval
- Excellent size and preservation from a UK heritage site
- Supplied with a Certificate of Authenticity
- 100% genuine and ethically sourced fossil
- Ideal for collectors, academic institutions, or interior display
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