Noun
bioturbation (countable and uncountable, plural bioturbations)
(geology) the mixing of soil or sediment by living organisms
No single axis of causality can be discerned to segregate the biological from geomorphological systems in soils. citation citation Paleoecological studies of soils places the origin for bioturbation to a time before the Cambrian period. Source: Internet
This burrowing is called bioturbation by sedimentologists. Source: Internet