A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, resulting in flooding. 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...
Found on
http://en.wikipedia.org/wiki/Marine_transgression
Rise in sea-level, causing submersion of a land mass and the deposition of marine sediment. Conversely, marine regression causes deposition to cease and erosion to commence.
Found on
https://www.encyclo.co.uk/local/20501
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