Original horizontality

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The Original Horizontality is part of the Danish scientist Nicolaus Steno 1667 who laid the foundations for the modern science of stratigraphy.

This principle states that sediments are deposited under the influence of gravity as nearly horizontal beds. Observations in a wide variety of sedimentary environments support this principle. If we find folded or faulted strata, we know that the layers were deformed by tectonic forces after the sediments were deposited. This principle can be combined with the law of superposition.