bioturbation

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bi·o·tur·ba·tion

 (bī′ō-tər-bā′shən)
n.
The stirring or mixing of sediment or soil by organisms, especially by burrowing or boring.

[German : bio-, bio- + Latin turbātiō, turbātiōn-, distrubance (from turbātus, past participle of turbāre, to stir up; see disturb).]

bi′o·turbed′ (-tûrbd′) adj.

bioturbation

(ˌbaɪəʊˌtɜːˈbeɪʃən)
n
the stirring of sediment by organisms
References in periodicals archive ?
These facies pass laterally northward into heavily bioturbated, pale green, argillaceous, micrite facies that carry in situ lingulid brachiopods and mollusks; these are inferred to record shallow lagoonal settings.
Unlike the Lumsden Dam Formation this unit lacks cross-laminated siltstone and sandstone beds, but is mildly bioturbated.
Micromorphological thin sections (analysed by Charles French) confirmed that the dark colour of the fill was a result of high organic content, probably resulting from the addition of large amounts of organic matter, which had then become oxidised, humified and bioturbated.
Field studies have indicated that Patti formation shales are found at the base of an outcrop section at Ahoko along the Koton-Karfi and Abaji axis, occurring alongside siltstones, claystones and sandstone inter-bedded with bioturbated ironstone.
Here, a 10 m thick section composed of heterolithic facies (conglomerates and fine to medium grained sandstones) was deposited under littoral shallow marine conditions, including several tidal channel deposits represented by glauconitic bioturbated sandstones that bear the local fossil flora.
Mud that's been churned up, or bioturbated, would be softer, freed of the stiff microbial mat that covered much of the seafloor.
1989), which occurs within the bioturbated and oxic zones of sediment seafloor.
North of Saguenay River, most of these sediments are deposited on the floor of the Laurentian Channel, which previous studies have indicated to consist mainly of dark grey, bioturbated, fine silts (Nota and Loring 1964; St-Onge et al.
The association of megarippled sandstone beds and interbedded laminated and bioturbated fine-grained sediments indicates this sequence was deposited in a near-shore environment.
2004) or cohesive soils with an interconnected macropore structure, such as bioturbated tidal-flat muds.
The oxidized and bioturbated material at these locations has lost any resemblance to cohesive laminated lacustrine sediment.