Ingression, Regression, and Transgression
A transgression is a landward shift of the coastline while regression is a seaward shift. The terms are applied generally to gradual changes in coast line position without regard to the mechanism causing the change. In addition, these terms usually are applied to changes over periods greater than 100 years as can be expected to be recorded by facies distributions in the geologic record or the stratigraphic interpretation of seismic reflection. “Transgressions” and “regressions” are commonly used, for example, to refer to coast line changes due to glaciations, which cause both eustatic sea-level changes and subsidence or rebound. Of particular significance is the “Holocene transgression” which corresponds to a eustatic rise in sea level of between 100 and 130 m and between 18,000 and 6,000 year bp. The terms also have been applied, however, to changes occurring over shorter time scales in, for example, Lake Chad.
“Ingression” refers to the advance of marine conditions into...
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