The shoreline deposits that are progressively overlain by Deeper water sediments represent transgression of the sea whereas deep marine deposits overlain by shallow Marine sediments represent regression of the sea.
The marine transgression is a geologic phenomenon that occurs on the seas due to which sea level rises higher relative to the land and the shoreline moves toward higher ground, which results in flooding of the nearby areas. Hence, we can say that transgression is a landward shift of the coastline while regression is a seaward shift. The marine regression is a geological phenomenon that occurs when areas of submerged seafloor are exposed above the sea level and patches of land become visible in between the waters of the sea. A prominent example of regression is visible at Palk Strait or Adam's bridge.
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