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::Stratigraphic unit

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A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".


Stratigraphic unit sections
Intro  Lithostratigraphic units  Biostratigraphic units  See also  References  External links  

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A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".


Stratigraphic unit sections
Intro  Lithostratigraphic units  Biostratigraphic units  See also  References  External links  

PREVIOUS: IntroNEXT: Lithostratigraphic units
<<>>