Fossil sharks teenth - Stratigraphy

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Stratigraphy

The book of science

Tom Sharp

Nicolas Steno stratigraphy

Stratigraphy

Principles

Time and logic

Nicolas Steno’s four principles of stratigraphy in “Principles” are superposition, original horizontality, lateral continuity, and cross-cutting relationships, according to Michael E. Brookfield. Above, those principles are in his own words as translated by John Garrett Winter.

See also in The book of science:

Readings on wikipedia: