Ichnofauna
Trace fossils are associated with many Burgess Shale-type deposits. They are often associated with the innards of soft-bodied organisms, and are particularly prevalent under the carapaces of bivalved arthropods. Burrowing organisms seem to have used the high-sulfur decay fluids as a nutrient source when farming bacteria in the microenvironment under the carapaces, indicated by their repeated uses of individual burrows.
Read more about this topic: Burgess Shale Type Fauna