Parasequence

A parasequence is a fundamental concept of sequence stratigraphy.

Parasequences are not directly related to sequences.

A parasequence is defined as a genetically related succession of bedsets that is bounded by marine flooding surfaces (or their correlative surfaces) on top and at the bottom.

[1] The succession is supposed to be relatively conformable in the sense that breaks in deposition within the parasequence are much shorter than the time of deposition of the parasequence itself.

[2][1] Most parasequences show a shallowing upward,[3] which is sometimes also included into the definition.