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A nifty addition overall, if I may say so. That being said I doubt it goes well with just any old cephalopod related article but it certainly makes a nice supplement to pages on higher (highest) taxa.
I hope nobody minds, but I edited the Mesozoic and Cambrian portions to put, what seems to me, better stratigraphic groupings.
I doubt that the Paleozoic sans Cambrian or the Mesozoic need to be further subdivided into periods ( it might appear too involved). I will be working on (unless someone beats me to it) putting Paleozoic forms (Ordovician and later) in a more logical, phylogenitic order.