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In the broadest sense, any kind of sediment disturbance is bioturbation .
In the present article, we use high-resolution chemical and radiochemical data as the basis for a numerical simulation of sediment accumulation, bioturbation , and episodic deposition or erosion in a dynamic estuary.
The abrupt facies shift, bioturbation and cemented nature of the surfaces suggests that they represent marine flooding surfaces, formed during a rapid rise in relative sea level and/or a reduction in sediment supply.
Rates of sediment accumulation, differential bioturbation and preservational processes may also have influenced the final diversity of fossils in the rocks.
The random inclination of other concentrations of fragmentary specimens is indicative of post mortem disturbance due to bioturbation .
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