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Another essential concept in stratigraphy is the unconformity.

For instance, an orogenic episode (a long geologic episode of mountain building) may finally come to end and the eroded mountains may be buried beneath a new sequence of sediments.Stratigraphy started to become a formal science due to the work of a man who published under the name Nicolaus Steno in the 17th century.Steno made careful geologic observations and illustrations.He published the results of his work and established a basic set of principles for interpreting sedimentary strata.Geologists still use Steno's principles, with some refinements and additions.

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