This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
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B. Kummel, 1962 - Ammonites from the Meekoceras graciliatus zone at Crittenden Spring, Elk County, Nevada - Journal of Paleontology (36), 638-703 (journal article, English)
E. T. Tozer, 1961 - Triassic stratigraphy and faunas, Queen Elizabeth Islands, Arctic Archipelago - Geological Survey of Canada Memoir (316), 1-116 (serial monograph, English)
J. P. Smith, 1927 - Upper Triassic marine invertebrate faunas of North America - United States Geological Survey Professional Paper (141), 1-262 (serial monograph, English)
O. A. Welter, 1922 - Die Ammoniten der Unteren Trias von Timor - Palaeontologie von Timor (11), 83-160 (serial monograph, German)
J. P. Smith, 1914 - The Middle Triassic marine invertebrate faunas of North America - United States Geological Survey Professional Paper (83), 1-254 (serial monograph, English)
A. Hyatt, 1905 - The Triassic cephalopod genera of America - United States Geological Survey Professional Paper (40), 1-394 (serial monograph, English)
C. Diener, 1897 - The Cephalopoda of the Lower Trias - Palaeontologia Indica (15), 1-581 (serial monograph, English)