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Here is some more info.

Some of the sediments deposited in the water is contaminated. This can make all of the organisms living in the estuary sick. Most of the contaminated sediments come from storm water runoff, and building sites.

A building site can contribute more sediment into the water than would normally be deposited by several decades.

Deposited sediments create sedimentary rocks. Sedimentary rocks contain many fossils of organisms that had died and then covered by the sediment.

Deforestation is also a big problem with sediment deposits. When trees are torn from the ground all of the excess dirt and mud that was in the roots piles up and gets washed away by rain into the nearest waterway. When trees are burned the ash and dirt from the tree gets washed away.