Natural History - British Fossil Aspidoceras Ammonite Display with Incredible Spines
Jurassic Period, circa 200 million years B.P.. Comprising an excessively large and rare specimen of Aspidoceras Logispinum, displaying superb lateral spines or tubercles; developed from the grey lias matrix. See Sepkoski, Jack, A Compendium of Fossil Marine Animal Genera, Bulletins of American Paleontology 363, 2002, pp.1-560, for discussion.
5.5 kg, 27 cm (10 1/2 in.).
From North Yorkshire, UK.