{{cite book| last = Martin| first = William| title = Petrificata Derbiensia p33-34| url = https://books.google.com/books?id=5EIAAAAAQAAJ%7C[permanent dead link] access-date = 2011-02-24| year = 1809| publisher = D. Lyon| quote = p39 Fig 4....A fossil shell. The original [was] a nautilus ....The "crocodile" said to be found in the limestone of Ashford, appears to be just a large specimen of this or some other Orthoceratite [Orthoceras]
