What geologic event is probably indicated by this irregular coast,with estuaries?

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An irregular coast with estuaries is typically formed by a rise in sea level, which floods low-lying areas along the coast and creates new inlets and estuaries. A drop in sea level would result in a more linear shoreline with exposed land, while erosion due to tsunamis or the uplift of submarine canyons would not necessarily result in the formation of estuaries.

What Geologic Event Is Probably Indicated by This Irregular Coast,with