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13-Jul-2017 03:18

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this is why it is said that present is the key to the past.

by understanding this concept, rock dating is done by looking into the past, for instance an outcrop of strata are visible by careful examination you can tell whether the outcrop was made in the fluvial environment, glacial environment or perhaps deep-sea environment.

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It was already solid rock when it was intruded by mafic lamprophyric magma that scraped some pieces off of granitic rock and embedded them within the solidifying magma.his document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale.It is not about the theory behind radiometric dating methods, it is about their , and it therefore assumes the reader has some familiarity with the technique already (refer to "Other Sources" for more information).However, note that because of the "principle of cross-cutting relationships", careful examination of the contact between the cave infill and the surrounding rock will reveal the true relative age relationships, as will the "principle of inclusion" if fragments of the surrounding rock are found within the infill.

Cave deposits also often have distinctive structures of their own (e.g., spelothems like stalactites and stalagmites), so it is not likely that someone could mistake them for a successional sequence of rock units. Each of them is a testable hypothesis about the relationships between rock units and their characteristics.Much of the Earth's geology consists of successional layers of different rock types, piled one on top of another.