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Aspects of the topic goniatite are discussed in the following places at Britannica.
...patterns where they join the outer shell. The complexity of these suture patterns culminated in the ammonites of the Mesozoic Era. From their origin (probably in the Emsian Age) the evolution of goniatite ammonites, as well as other ammonites, allows detailed zonal subdivisions to be established until the end of the Cretaceous Period. Devonian goniatites have been found on all continents...
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