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- W4247792086 abstract "An ichnofabric originates from the interaction of burrowing and/or bioeroding organisms with their substrate and is subject to taphonomic and diagenetic alteration. In oxygenated, soft sediment, just below the surface, a mixed layer is established that is completely bioturbated and disturbed. Downward it grades into the transitional layer, characterized by discretely preserved traces, while below that, in the historical layer, no new traces are formed. The appearance of ichnofabrics can be manifold and depends on their developing history. Simple ichnofabrics are monospecific and originate from opportunistic short-term bioturbation or from successive phases of habitat utilization/sediment exploitation over time. Composite ichnofabrics contain several ichnotaxa and document continuous or interrupted sedimentation over a longer period of time. They can be autocomposite (originating from a single benthic community shifting its position upward in pace with gradational sedimentation), heterocomposite (having one or more benthic communities acting in different sedimentary facies), or ultracomposite (being the product of benthic communities of contrasting age and depositional systems). Completely bioturbated sediment without any discernible stratification, tiers or discrete ichnotaxa is referred to as bioturbate texture (in its original meaning). Various physical, chemical and ecological conditions affect the development of an ichnofabric, including benthic community structure, sediment properties, oxygenation, salinity and nutrition. Ichnofabric analysis is performed stepwise and includes the recognition of bounding surfaces and sedimentological features, quantification of bioturbational structures, identification of ichnotaxa and tiering, mapping burrow size, ichnodiversity and ichnoabundance, and investigating the taphonomic and diagenetic overprint. Ichnofabrics store important information about environmental conditions and thus have a broad field of application, including facies reconstruction, sequence stratigraphy and reservoir characterization." @default.
- W4247792086 created "2022-05-12" @default.
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- W4247792086 date "2021-01-01" @default.
- W4247792086 modified "2023-10-16" @default.
- W4247792086 title "Ichnofabric" @default.
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- W4247792086 doi "https://doi.org/10.1016/b978-0-12-409548-9.12051-2" @default.
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