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Red is interval in Figure 16, click column or here to open.

Figure 10. Chronostratigraphic chart of the Columbus Basin, showing progradational character of the basin fill throughout the Pliocene and Pleistocene. Regional subsidence in the southwest parts of the basin resulted in continuous aggradation of mixed fluvial and estuarine deposits over much of the area. Unconformities exhibit the greatest amounts of missing time in locations central to the structural hinge of each megasequence. Foraminiferal and palynological ranges are from Pocknall et al. (1999).