"Nautiloids"

22nd March 2009

This collection contains various Palaeozoic non-ammonoid cephalopods and some Carboniferous to Paleogene nautilids.

These have often been grouped together as "nautiloids", but Gabbott (1999), describing Ordovician orthocones with preserved radulae says "Orthocone radula configuration is more similar to that of ammonoids and coleoids than to that of nautiloids."

Endoceras, 14 cm orthocone cephalopod showing exposed siphuncle. Poolville Member, Bromide Formation, Blackriverian, Ordovician, Dunn Quarry, Criner Hills, Carter County, Oklahoma, USA.	Nanno sp. 47 mm. Decorah Shale, Middle Ordovician. Rochester, Minnesota, USA.	Treptoceras sp, 24 cm orthocone. Waynesville Formation, Cincinnatian Series, Upper Ordovician. Warren County, Ohio, USA.	Pyritized orthocone cephalopod, 59 mm long. Utica Shale Group, near Martinburg, New York State, USA.
Orthocone (90 mm long) with Barrandia parabolica (40 mm long) and Didymograptus artus. Llanvirn Series, Hope Shales, Minsterley, Shropshire, UK.	Strandoceras sp. 32 mm cyrtocone cephalopod with very fine ornamentation, Llanvirn Series, Hope Shales, Leigh, Shropshire, UK.	Tarphyceras sp, a rare nautiloid, 35mm, from the Llandeilo, teretiusculus Shales of Shropshire, UK.	Dawsonoceras americanum, 15 cm orthocone. Rochester Shale, Middle Silurian. Caleb’s Quarry, New York, USA.
Paraphragmites ibex, 37 mm cephalopod with complete mouth border. Lower Leintwardine Formation, Late Silurian. Near Leintwardine, Herefordshire, England.	21 cm complete pyritized orthocone. Hunsruckschiefer, Early Devonian. Bundenbach, Germany.	Orthocone, 128 mm, with traces of soft part preservation, in micrite. Taylor Formation, Bear Gulch, Fergus County, Montana, USA.	70 mm Rayonnoceras solidiforme showing complex siphuncle. Carboniferous, Arkansas.
25 mm nautilid. Visean, Treak Cliff, Castleton, Derbyshire, UK.	38 mm nautilid, Early Permian, Actubinskaya region, Kazakhstan.	27 mm nautilid (?Tylonautilus), Early Permian, Actubinskaya region, Kazakhstan.	30 mm nautilid with shell preserved. Norian, Triassic. Pardonet Hill, British Columbia, Canada.
Triassic Germanonautilus beak from Wollmersheim, Germany.	Upper jaw Rhyncholithes (20 mm long) of Triassic Germanonautilus beak from Wollmersheim, Germany.	Upper jaw Rhyncholithes (20 mm long) of Triassic Germanonautilus beak from Wollmersheim, Germany.	Lower jaw Conchorhynchus (14 mm long) of Triassic Germanonautilus beak from Wollmersheim, Germany.
Paracenoceras hexagonum, 36 mm. Lower Bathonian, Middle Jurassic. St Benin d'Azy, Nieve, France.	90 mm nautilid, Lower Chalk, Shepwick Quarry, Uplyme, Dorset, UK.	75 mm nautilid. Jafnayn Formation. Muscat, Oman.	Cimomia imperialis, 4 cm, London Clay. Isle of Sheppey, Kent, UK.