Lithostratigraphy

the principle of intrusive relationship states tha t when an igneous rock cuts across a formatuion of sedimentary rock, then we can say that the igneous intrusion is younger than the sedimentary rock.

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th e principle of supeposition states thatr a seddimentary rock layer in a tectonically undisturbed is younger than the one beneath and older than the one above it.

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the principle of original horizontality states that th e deposition of sediments occurs as essentially horizontal beds.

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