Ammonoids
22nd February 2009

A selection of ammonoids, from Devonian Bactrites and anetoceratins through other goniatites and clymeniids to ceratitids and ammonites including their heteromorph representatives.

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Bactrites gracilis (Sandberger), 16 mm excellent pyritized example. Frasnian, U. Devonian. Wallersheim, Büdesheim, Eifel, Germany.
Bactrites gracilis (Sandberger), 16 mm excellent pyritized example. Frasnian, U. Devonian. Wallersheim, Büdesheim, Eifel, Germany.
Ivoites husnrueckianum, 44 mm, one of the earliest ammonoids and an important zone fossil for the Hunsrück Slate. Early Devonian, Bundenbach, Germany.
Ivoites husnrueckianum, 44 mm, one of the earliest ammonoids and an important zone fossil for the Hunsrück Slate. Early Devonian, Bundenbach, Germany.
 Gyroceratites gracilis, 11 mm showing finely preserved protoconch. Early Devonian, Morocco.
Gyroceratites gracilis, 11 mm showing finely preserved protoconch. Early Devonian, Morocco.
 Detail of protoconch in a Late Devonian (Frasnian) Manticoceras, 10 mm across, from Budesheim, Germany.
Detail of protoconch in a Late Devonian (Frasnian) Manticoceras, 10 mm across, from Budesheim, Germany.
Goniatite, very lightly pyritized, 25 mm across, with perfect mouth border and the siphuncle visible in the inner whorls. Early Devonian, Bundenbach, Germany.
Goniatite, very lightly pyritized, 25 mm across, with perfect mouth border and the siphuncle visible in the inner whorls. Early Devonian, Bundenbach, Germany.
 Manticoceras sp., 27 mm goniatite. Hatch Formation, Late Devonian. Ontario County, New York, USA.
Manticoceras sp., 27 mm goniatite. Hatch Formation, Late Devonian. Ontario County, New York, USA.
 Polonoceras sp, Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
Polonoceras sp, Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
 Cheiloceras sp. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
Cheiloceras sp. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
Goniatite (Tornoceratatina), Pseudoclymenia sp. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
Goniatite (Tornoceratatina), Pseudoclymenia sp. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
 Clymeniid (Cyrtoclymeniina), Praeflexiclymenia tenuis. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
Clymeniid (Cyrtoclymeniina), Praeflexiclymenia tenuis. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
 Cymaclymenia sp., 35 mm. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
Cymaclymenia sp., 35 mm. Lower Famennian, Devonian, Kowala Fm, S Holy Cross Mountains, Poland.
 ?Anthracoceras sp, (or the nautilid Stroboceras) 32 mm showing preservation of mandibles. Heath Shale Formation. Bear Gulch Limestone. Bear Gulch, Fergus County, Montana, USA.
?Anthracoceras sp, (or the nautilid Stroboceras) 32 mm showing preservation of mandibles. Heath Shale Formation. Bear Gulch Limestone. Bear Gulch, Fergus County, Montana, USA.
Muensteroceras aff truncatum, 27 mm. Visean, Treak Cliff, Castleton, Derbyshire, UK.
Muensteroceras aff truncatum, 27 mm. Visean, Treak Cliff, Castleton, Derbyshire, UK.
 Goniatites sp, 25 mm. Visean, Cracoe, Yorkshire, UK.
Goniatites sp, 25 mm. Visean, Cracoe, Yorkshire, UK.
 Beyrichoceras sp., 33 mm. Visean, Treak Cliff, Castleton, Derbyshire, UK.
Beyrichoceras sp., 33 mm. Visean, Treak Cliff, Castleton, Derbyshire, UK.
 Goniatite, ?Nomismoceras sp, 52 mm. Visean, Treak Cliff, Castleton, Derbyshire, UK.
Goniatite, ?Nomismoceras sp, 52 mm. Visean, Treak Cliff, Castleton, Derbyshire, UK.
Large (8 cm) three-dimensionally preserved goniatite Cancelloceras (Gastrioceras) listeri from the
Large (8 cm) three-dimensionally preserved goniatite Cancelloceras (Gastrioceras) listeri from the "Bullion Mine" G.listeri marine band, Lower Westphalian A (Langsettian) of Lancashire, UK.
 Uraloceras sp. 45 mm. Early Permian. Actubinskaya region, Kazakhstan.
Uraloceras sp. 45 mm. Early Permian. Actubinskaya region, Kazakhstan.
 Popanoceras sp. 38 mm. Early Permian. Actubinskaya region, Kazakhstan.
Popanoceras sp. 38 mm. Early Permian. Actubinskaya region, Kazakhstan.
 Two phylloceratid ammonites (Sturia, 35 mm and Flexoptychites, 28 mm) from the Mid Triassic Hallstat Limestone facies of the Greek Triassic. Phylloceratida is the order that gave rise to all post-Triassic ammonoids.
Two phylloceratid ammonites (Sturia, 35 mm and Flexoptychites, 28 mm) from the Mid Triassic Hallstat Limestone facies of the Greek Triassic. Phylloceratida is the order that gave rise to all post-Triassic ammonoids.
Arcestes sp, 35 mm. Reitzi Zone, Mid Triassic. Epidavros, Greece. The aperture is strongly constricted. Lewy (1996) interpreted body chambers with such apertures in terms of a floating egg case with the young hatched from tiny eggs feeding on the corpse of the mother (as in modern Argonauta octopods).
Arcestes sp, 35 mm. Reitzi Zone, Mid Triassic. Epidavros, Greece. The aperture is strongly constricted. Lewy (1996) interpreted body chambers with such apertures in terms of a floating egg case with the young hatched from tiny eggs feeding on the corpse of the mother (as in modern Argonauta octopods).
 Halorites macer, 78 mm. Norian, Columbianus Zone, Late Triassic. Bihati, Timor, Indonesia.
Halorites macer, 78 mm. Norian, Columbianus Zone, Late Triassic. Bihati, Timor, Indonesia.
 Phylloceras heterophyllum, 220 mm, Upper Lias, Lower Jurassic. Saltwick Bay near Whitby, North Yorkshire.
Phylloceras heterophyllum, 220 mm, Upper Lias, Lower Jurassic. Saltwick Bay near Whitby, North Yorkshire.
 The Lytoceratida arose from the Phylloceratida at around the Triassic-Jurassic boundary. This is Lytoceras cornucopia, 60 mm, from the Upper Lias, Early Jurassic. Ravenscar, North Yorkshire, UK.
The Lytoceratida arose from the Phylloceratida at around the Triassic-Jurassic boundary. This is Lytoceras cornucopia, 60 mm, from the Upper Lias, Early Jurassic. Ravenscar, North Yorkshire, UK.
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