Figure 4.23: Global Sea Level Fluctuations from the last 542 million years. Two different curves are shown and include different methods for assigning sea level. The datum is modern sea level, which is assigned a 0 value on the vertical axis. These datasets show that sea level has been both higher and lower than modern throughout different time intervals. One thing is for certain, sea level is never static and is always changing – either increasing or decreasing.
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