Three distinct methods of fixing the time line separating contiguous glacial and interglacial Ages (Flint and Moore, 1948) have come into use. These have been developed in the three major environments of Pleistocene sedimentation (exclusive of the normal marine environment)—namely (1) the till plains region of north-central United States, (2) the lower Mississippi Valley and northern coastal region of the Gulf of Mexico, and (3) the border of the till plains and extensive region of fluviatile and eolian deposition in the mid-continent. In the till plains province it has been customary to define the end of a glacial...

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