| The taxonomically diverse goniatites dominated the Carboniferous-Permian ammonoid fauna. |
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| Here, rifting took place in the Early Griesbachian and the Late Griesbachian, respectively, based on ammonoid data and radiometric dating. |
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| Curiously, other Cisuralian ammonoid localities in Nevada have yielded abundant ammonoids but no additional representatives of Uraloceras. |
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| The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades. |
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| The sediments are noted for their rich ammonoid faunas, which allow detailed biostratigraphic subdivision and correlation. |
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| Both Permian perrinitid ammonoid areas are located within the transitional belt between the active geosyncline and the adjacent stable platform. |
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| Strong uniformity in Permian ammonoid biostratigraphy and provincialism between Xinjiang and Pamir is suggested. |
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| Coiled shells, commonly of ammonoid cephalopods, nautiloids, or gastropods, have been given colloquial names such as rams' horns, snakestones, serpentstones, and conger eels. |
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| Therefore, in terms of geological age determined by radiolarians and the ammonoid, this brachiopod fauna should be assigned to the latest Changhsingian. |
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| This particular ammonoid is from the SouthPark Mall in Charlotte, North Carolina. |
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| However, Furnish pointed out that the ammonoid fauna of the Lamar is post-Guadalupian. |
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| It is difficult to compare these ammonoid assemblages with the European standards because of the absence of respective data. |
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| A new prodromitid ammonoid genus from the Hannibal Shale of Missouri. |
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| Through the climatic changes, conodont and ammonoid faunae were initially able to recover very quickly during the Early Triassic as unusually short-lived species emerged. |
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