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Classification of Frey 1981
Subcl.
Nautiloidea
Agassiz 1847 [nautiloid]
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Or. †
Orthocerida
Kuhn 1940
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Fm. †
Narthecoceratidae
Flower 1958
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G. †
Narthecoceras
Hyatt 1895
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†
Narthecoceras dunni
Frey 1981