Description This listing features a well-preserved fossil echinoid (sea urchin) of the species Holectypus depressus, collected from the Cornbrash Formation in Somerset, United Kingdom. This authentic Jurassic marine invertebrate fossil is provided with a Certificate of Authenticity, and the photo shows the exact specimen you will receive. Holectypus depressus belongs to: Order: Holectypoida Family: Holectypidae This echinoid lived during the Bathonian Stage of the Middle Jurassic Period, approximately 168–166 million years ago. The Cornbrash Formation consists of marine shelly limestones and mudstones deposited in a shallow marine, inner shelf environment that supported a diverse array of invertebrate life. Morphological Features: Flattened, oval test (shell) with a low dome profile Petaloid ambulacra with finely impressed pore pairs Oral surface flattened with distinct peristome Smooth to lightly granulated surface, often symmetrical These features suggest an infaunal or semi-infaunal lifestyle, with the organism likely burrowing or living on soft marine sediments. Specimen Details: Species: Holectypus depressus Fossil Type: Echinoid (Sea Urchin) Test Geological Unit: Cornbrash Formation Geological Age: Middle Jurassic (Bathonian Stage) Location: Somerset, United Kingdom Depositional Environment: Shallow marine shelf, calcareous muds and shelly limestones Family: Holectypidae This is a fine example of a Jurassic echinoid fossil from a historically significant geological unit in the UK, ideal for fossil collectors, educators, or anyone with a passion for ancient marine life. Scale rule squares/cube = 1cm. Please see the photograph for full sizing and condition. All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
