There are different types of coasts which are defined by the type of bedrock. Low sedimentary coasts are ones which are formed over plain sedimentary rocks. The coasts are usually smooth with occasional incursions of water in the form of lagoons and tidal creeks.
Low sedimentary coasts may have a few scattered islands that have been formed by deposition of sediments. These islands are usually elongated and parallel to the coastline. In low sedimentary coasts the sea level is very stable as compared to inter-tidal coasts.
Marshes and swamps may abound along the coasts. Depositional features dominate.
When waves break over a gently sloping sedimentary coast, the bottom sediments get churned and move readily building bars, barrier bars, spits and lagoons.
Lagoons would eventually turn into a swamp which would subsequently turn into a coastal plain. The maintenance of these depositional features depends upon the steady supply of materials
Storm and tsunami waves cause drastic changes irrespective of supply of sediments. Large rivers which bring lots of sediments build deltas along low sedimentary coasts.
