bioturbation

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bioturbation

[¦bī·o·tər′bā·shən]
(geology)
The disruption of marine sedimentary structures by the activities of benthic organisms.
References in periodicals archive ?
The first level consists of 10-90 cm thick medium-to coarse-grained micaceous sandstone beds, separated by erosion surfaces and fully bioturbated by vertical to steeply inclined 5-80 cm long tubes.
The overlying Awgu Group (Coniacian--Santonian) consists of the grey-blue Awgu-Ndeaboh Shale and the medium to coarse-grained bioturbated Agbani sandstone.
fusulinid rich sandy bioturbated limy###BeddedSand Facies Classification
2) show an upward progression into a highly bioturbated facies with abundant trace fossils, that lacks turbiditic structures.
Photographs indicate that margin sediments are generally highly bioturbated (Fig.
In strongly bioturbated intervals, clay minerals are concentrated to wall linings of tunnels formed by the activity of in-fauna, or to the passive fill of burrows.
Nitrogen cycling in lake sediment bioturbated by Chironomus plumosus larvae, under different degrees of oxygenation.
Elsewhere, the marine sediments are horizontally bedded and highly bioturbated and commonly contain fossil red algal fragments and barnacles.
The association of megarippled sandstone beds and interbedded laminated and bioturbated fine-grained sediments indicates this sequence was deposited in a near-shore environment.
Prothero and Schwab, 1996) are present on the top of bioturbated magnetite-rich units (magnetite lenses) of the oldest facies of the Cotui Limestone, Cabo Rojo-San German, in southwestern Puerto Rico (Santos, 1990, 1999).
2004) or cohesive soils with an interconnected macropore structure, such as bioturbated tidal-flat muds.