Classification of Atabekyan and Khakimov 1976
Fm. †Placenticeratidae Hyatt 1900
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G. †Hoplitoplacenticeras Paulcke 1906
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†Hoplitoplacenticeras coesfeldiense Schluter 1867
†Hoplitoplacenticeras marroti Coquand 1859
†Hoplitoplacenticeras vari Schlüter 1872
Fm. †Ptychoceratidae Meek 1876
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Fm. †Nostoceratidae Hyatt 1894
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G. †Didymoceras Hyatt 1900
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†Didymoceras schloenbachi Favre 1869
†Didymoceras vancouverensis Gabb 1864
G. †Nostoceras Hyatt 1894
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†Nostoceras draconis Stephenson 1941
†Nostoceras excelsus Anderson 1958
†Nostoceras hyatti Stephenson 1941
Fm. †Diplomoceratidae Spath 1926
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Fm. †Scaphitidae Gill 1871
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G. †Trachyscaphites Cobban and Scott 1964
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†Trachyscaphites gibbus Schlüter 1872
†Trachyscaphites pulcherrimus Roemer 1841
†Trachyscaphites spiniger Schlüter 1872