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The Ordovician zone index conodont Amorphognathus ordovicicus Branson & Mehl, 1933 from its type locality and the evolution of the genus Amorphognathus Branson & Mehl, 1933

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Figure

Table 1. Late Ordovician conodonts currently known from Branson & Mehl’s (1933b) Ozora locality.
Fig. 2. Photos of the abandoned Ozora Quarry, which is the source of Branson & Mehl’s (1933b) Upper Ordovician conodont fauna from the lowermost Maquoketa Shale: (a) view of the quarry face formed by the Thebes Sandstone; (b, c) close-up of the topmost par
Fig. 3. Stratigraphical diagram showing the succession at the Ozora Quarry compared with the coeval successions at Cape Girardeau and Barnhart(the latter two after Thompson, 1991)
Fig. 4. SEM micrographs of some conodont species recently collected from the Ozora Quarry
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