Calcareous cementation of unconsolidated sediments and soils within the zone of water-table fluctuation in tropical climates results in the development of widespread layers of water-table rock that extend between beach rock and stream rock outcrops as well as for considerable distances inland. Along cliffy coasts in any climate, the water table separates weathered and leached rock, which is readily erodible, from underlying sections of relatively resistant rock. Along seacoasts, the water-table boundary commonly is expressed by the presence of platforms, shoals, and erosionally flattened bedrock in beaches (pseudo-beach rock). For the reason that coastal retreat lowers water tables, truncated flats commonly develop at successively lower levels, and the resulting topography is subject to misinterpretation, such as the postulation of a very recent, somewhat higher, stand of sea level.

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