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What (who) is biogenous sediments - definition
!['''Total sediment thickness of the ocean floor'''}} Deposits are thick on the continental shelves, and thinnest in the deep sea on either side of the [[mid-ocean ridge]].](https://commons.wikimedia.org/wiki/Special:FilePath/Marine sediment thickness.jpg?width=200 "'''Total sediment thickness of the ocean floor'''}} Deposits are thick on the continental shelves, and thinnest in the deep sea on either side of the [[mid-ocean ridge]].")
![Top of a metric regressive cycle with [[desiccation]]s, surface of bed dolomitised. Middle liassic of the High Atlas, Morocco.](https://commons.wikimedia.org/wiki/Special:FilePath/Desiccation Rnim.jpg?width=200 "Top of a metric regressive cycle with [[desiccation]]s, surface of bed dolomitised. Middle liassic of the High Atlas, Morocco.")
Wikipedia
Pelagic sediment or pelagite is a fine-grained sediment that accumulates as the result of the settling of particles to the floor of the open ocean, far from land. These particles consist primarily of either the microscopic, calcareous or siliceous shells of phytoplankton or zooplankton; clay-size siliciclastic sediment; or some mixture of these. Trace amounts of meteoric dust and variable amounts of volcanic ash also occur within pelagic sediments. Based upon the composition of the ooze, there are three main types of pelagic sediments: siliceous oozes, calcareous oozes, and red clays.
The composition of pelagic sediments is controlled by three main factors. The first factor is the distance from major landmasses, which affects their dilution by terrigenous, or land-derived, sediment. The second factor is water depth, which affects the preservation of both siliceous and calcareous biogenic particles as they settle to the ocean bottom. The final factor is ocean fertility, which controls the amount of biogenic particles produced in surface waters.
