One of the many joys of geology is gaining sufficient insight into a landscape to enable four-dimensional vision. Instead of seeing just a hill, the insightful geologist sees gently dipping clays and sandstone strata, deposited during a marine highstand, overlain by a series of much more recent conglomeratic terraces, deposited by a river cutting and sculpting a modern valley. Unfortunately, even the most astute and experienced geological observer often cannot interpret a landscape alone without additional information and evidence, for example relating to absolute ages and rates and the way in which geology connects together regionally. This is especially true...

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