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Lateral continuity – Imagine you are looking across a landscape with flat layers of rock. You spot a distinctive white layer, and then a gap caused by a valley. You continue scanning across the valley and spot the same white layer on the other side. How did this occur? Nicholas realised that the layers were once connected, and a river carved out the gap between. A great example of this law of lateral continuity can be seen in the Blue Mountains, west of Sydney. Lateral means sideways, so this phrase means continuous in a sideways direction.