Biological Structures
A number of biologically-created sedimentary structures exist, called trace fossils. Examples include burrows and various expressions of bioturbation. Ichnofacies are groups of trace fossils that together help give information on the depositional environment. In general, as deeper (into the sediment) burrows become more common, the shallower the water. As (intricate) surface traces become more common, the water becomes deeper.
Microbes may also interact with sediment to form Microbially Induced Sedimentary Structures.
Read more about this topic: Sedimentary Structures
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