Question

What causes Transgression and Regression?

Transgression is the deepening water or an inland migration of coastline. Regression on the other hand in water becoming shallow or the seaward migration of the coastline. What causes this to happen? What accounts for the ordering of rocks along the shoreline?

Answer 1

Answer:-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.Transgressions can be caused either by the land sinking or the ocean basins filling with water (or decreasing in capacity). Transgressions and regressions may be caused by tectonic events such as orogenies, severe climate change such as ice ages or isostatic adjustments following removal of ice or sediment load.

Transgression occurs when the ocean basins have more quantity of water (deep water)than their capacity. It can also occur when the land starts sinking into the sea. It results in a flood that is known as transgression.
In the same way, the term regression works oppositely. When the water level in the ocean basins is at a lower level than their capacity, the sea starts to expose the previously covered lands. The submerged seafloor is exposed as a result. This process is known as regression. All the changes we see are horizontal rather than vertical.

Transgressions and regression accounts fir the ordering of rocks along the shoreline.

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