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Attached are two useful charts depicting the known orders of nautiloids and ammonoids showing their abundance and time ranges.
From ENK Clarksons "Invertebrate Palaeontology and Evolution" 4th ed. 1998.
Please just click on the thumbnail images for a larger versions.
From ENK Clarksons "Invertebrate Palaeontology and Evolution" 4th ed. 1998.
Please just click on the thumbnail images for a larger versions.