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TOPIC 1 - TOPIC 1 Geological Time and Geological Principles...

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TOPIC 1 – Geological Time and Geological Principles Introduction Relative geological time scale – a product of placing rocks in their proper sequence of formation to create a composite record of geological events Radiometric age dating allowed geologists to determine absolute ages (yielded an absolute geological time scale) Important Principles Principle of superposition – unless turned upside down, the oldest rocks are at the bottom and get progressively younger Principle of original horizontality – particles which settle under the influence of gravity settle to more nearly horizontal layers Principle of original lateral continuity – strata extend in all directions until they thing against the edges of the basin in which they have accumulated Principle of cross-cutting relationships – disturbed rocks or strata are older than those rocks which disturb them or cut through them Principle of fossil succession – fossil species succeed one another
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