Reisz and Laurin (2001) documented the presence of the reptile Macroleter in the Chickasha Formation of Oklahoma and concluded “that the Chickasha Formation. . . belongs to the Guadalupian, and that it is equivalent in age to the late Kazanian, or early Tatarian of the Russian platform” (p. 1231). In advocating this correlation, they ignored marine biostratigraphy and magnetostratigraphy that indicate that the Chickasha Formation is substantially older than the late Kazanian.

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In Oklahoma, the marine Blaine Formation generally overlies the Chickasha Formation, and southward into Texas, the Chickasha is laterally equivalent to the San Angelo Formation (e.g., Fay, 1964...

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