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Superposition identification and geology

The principle that in an undisturbed sedimentary sequence, the oldest layers lie at the bottom and the youngest at the top. This is one of the most fundamental principles in geology, first articulated by Nicolaus Steno in 1669, and forms the basis for establishing relative age relationships in sedimentary and volcanic rock sequences. The principle does not apply where tectonic activity has overturned the strata. Field: stratigraphy. Example: Applying the principle of superposition to the layered sedimentary rocks exposed in the walls of the Grand Canyon, geologists established that the Kaibab Limestone at the rim is the youngest formation and the Vishnu Schist at the river level is the oldest.. Related terms: Relative age, Cross-cutting, Original horizontality, Steno's laws.

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Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner
GeoMiner
Last updated
2026-03-30T15:19:42.096023+00:00
Review status
Published; not independently peer-reviewed
  • USGS Thesaurus — U.S. Geological Survey. Controlled earth-science terminology used to describe USGS information resources.
  • Glossary of Geologic Terms — U.S. National Park Service. Geologic definitions prepared by the NPS Geologic Resources Inventory.

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Common questions

What does Superposition mean in geology?
The principle that in an undisturbed sedimentary sequence, the oldest layers lie at the bottom and the youngest at the top. This is one of the most fundamental principles in geology, first articulated by Nicolaus Steno in 1669, and forms the basis for establishing relative age relationships in sedimentary and volcanic rock sequences. The principle does not apply where tectonic activity has overturned the strata.
What is an example of Superposition?
Applying the principle of superposition to the layered sedimentary rocks exposed in the walls of the Grand Canyon, geologists established that the Kaibab Limestone at the rim is the youngest formation and the Vishnu Schist at the river level is the oldest.
Which earth-science field uses the term Superposition?
Superposition is used in stratigraphy.
Which terms are related to Superposition?
Related terms in this reference are Relative age, Cross-cutting, Original horizontality, Steno's laws.

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