Fossil Nautilus – Cenoceras – Jurassic Black Ven Marls – Charmouth Lyme Regis UK – Genuine with Certificate

Description A beautifully preserved Fossil Nautilus of the genus Cenoceras, discovered at Stonebarrow Cliff, Charmouth on the Jurassic Coast, Lyme Regis, Dorset, UK. This exceptional specimen was unearthed by our own team members Alister and Alison on 26 April 2025, and has been carefully cleaned, prepped, and treated by Alison. This fossil originates from the Black Ven Marls, part of the Lower Lias Formation, dating to the Lower Jurassic, approximately 200 to 190 million years ago. The Charmouth area is a world-renowned site for Jurassic marine fossils, particularly cephalopods such as ammonites and nautiloids. Cenoceras is an extinct genus of nautiloid, belonging to a lineage of cephalopods that have survived through vast geological epochs. Unlike the tightly coiled ammonites, nautiloids like Cenoceras had more loosely coiled shells with a central siphuncle, and were efficient swimmers in ancient shallow seas. This fossil displays the characteristic coiled morphology with gently curving whorls, chamber partitions (septa), and subtle surface patterning—some of which may be weathered due to its age and preservation. It is a genuine, one-of-a-kind specimen, professionally photographed with a 1cm scale cube—please refer to the photo for full sizing.   Geological & Taxonomic Information: Genus: Cenoceras Common Name: Fossil Nautilus Fossil Type: Nautiloid shell Geological Period: Jurassic Epoch: Early Jurassic Geological Stage: Sinemurian Formation: Lower Lias (Black Ven Marls Member) Location: Stonebarrow Cliff, Charmouth, Lyme Regis, Dorset, UK Order: Nautilida Superfamily: Nautilaceae Family: Nautilidae Depositional Environment: Shallow marine basin, low oxygen sediment-rich environment Morphological Features: Coiled shell with moderate involution, central siphuncle, chambered internal structure, curved sutures   What You Receive: The exact specimen shown in the listing photos A Certificate of Authenticity verifying the fossil is 100% genuine Expert packaging and fast, secure delivery Ideal for fossil collectors, natural history lovers, and enthusiasts of marine prehistory. A true piece of Britain’s deep geological past.   Note: All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. Scale cube = 1cm. Please see photo for full sizing.