Sequence (geology)

In geology, a sequence is a stratigraphic unit which is bounded by an unconformity at the top and at the bottom.[1]

## Definition

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In a more rigorous and general way, a sequence is defined as a

"relatively conformable [...], genetically related succession of strata bounded by unconformities or their correlative surfaces"[2]

## Special cases and related concepts

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Special cases of sequences include type 1 sequences and type 2 sequences.[3] A related concept are parasequences. Contrary to their name they are not smaller sequences.

## See also

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* Catena (soil)
* Sequence stratigraphy

## References

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1. ^ Catuneanu, Octavian (2011). "Sequence stratigraphy: methodology and nomenclature" (PDF). Newsletters on Stratigraphy. 44 (3). E. Schweizerbart'sche Verlagsbuchhandlung: 183. doi:10.1127/0078-0421/2011/0011.
2. ^ Patzkowsky, Mark E.; Holland, Steven M. (2012). Stratigraphic Paleobiology. Chicago: University of Chicago University Press. p. 220.
3. ^ Patzkowsky, Mark E.; Holland, Steven M. (2012). Stratigraphic Paleobiology. Chicago: University of Chicago University Press. pp. 42–43.

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