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Correlating two separated outcrops means establishing that they share certain characteristics indicative of contemporary formation.

The most useful indication of time equivalence is similar fossil content, provided of course that such remains are present.

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

What they could do was determine the ages of materials relative to each other. They could also determine when a process occurred relative to those rocks. The laws of stratigraphy can help scientists understand Earth’s past.

Using sensible principles they could say whether one rock was older than another and when a process occurred relative to those rocks. The laws of stratigraphy are usually credited to a geologist from Denmark named Nicolas Steno. The laws are illustrated in the Figurebelow; refer to the figure as you read about Steno’s laws below.

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However, "relative" dating or time can be an easy concept for students to learn.Presumably if all the world’s outcrops were integrated, sediments representing all of geologic time would be available for examination.This optimistic hope, however, must be tempered by the realization that much of the record—older than 541 million years—is missing.Absolute dating entails laboratory analysis of rock samples that will take a longer time.further, the dating results will still have to be cross-checked with mapping data.

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