Description
This listing features a rare and well-preserved 8-inch specimen of Dorsetensia liostrata, an elegant fossil ammonite from the Upper Bajocian Stage of the Middle Jurassic, discovered at Frogden Oborne, Dorset, United Kingdom. This specimen comes from the respected Alice Purnell Collection, and the photo provided shows the actual fossil you will receive.
Geological Context:
- Species: Dorsetensia liostrata
- Geological Period: Jurassic
- Stage: Upper Bajocian (~170 to 168 million years ago)
- Location: Frogden Oborne, Dorset, UK
- Depositional Environment: Shallow marine environment with well-oxygenated shelf conditions, typically rich in calcareous mudstone and bioclastic debris, ideal for ammonite fossil preservation
Taxonomic Classification:
- Family: Sonniniidae
- Superfamily: Hildoceratoidea
- Order: Ammonitida
- Suborder: Ammonitina
- First Described By: Oppel, 1865
Morphological Features:
Dorsetensia liostrata is characterised by a smooth, finely ribbed, evolute shell with a broad umbilicus. The whorls are low and compressed, with weakly defined ribs and a rounded venter. Unlike many more ornate ammonites, its simplicity in form reflects a transitional morphology within mid-Jurassic ammonite evolution. This 8″ specimen is notable for its size and exceptional detail.
Stratigraphic and Scientific Significance:
Dorsetensia liostrata is a biostratigraphically useful species for correlation within the Upper Bajocian of Western Europe. Its presence helps define part of the Niortense or Parkinsoni Biozones in British Jurassic sequences. The genus Dorsetensia represents a relatively short-lived but regionally important ammonite lineage during a period of significant faunal turnover.
Additional Details:
- All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
- Scale Rule Squares / Cube = 1cm: Full sizing visible in the provided photo.
- Part of the scientifically curated Alice Purnell Collection.
Whether for education, research, or personal display, this rare ammonite fossil is a striking and scientifically valuable example of Middle Jurassic marine life from the Dorset Coast.
Add this exceptional piece to your collection today.
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