Creeping, Burrowing, Boring
Other than body fossils, trace fossils do not preserve skeletons but traces of organismic activity on or within the sediment. Hence, they document behaviour patterns of extinct animals. According to the basic functions of living, moving, and foraging, the trace fossil types can be classified as: burrows, as resting and creeping traces, and as browsing and feeding traces. Moreover, similar traces can be produced by different organisms, and the same animal can produce different traces. Trace fossils may also prove the existence of organisms, which can otherwise not be identified because they have no skeletons that could be preserved as body fossils. Some types of Muschelkalk sediments are extensively bioturbated. Depending on the primary consistence of the seafloor, sediments display traces produced in muddy or in firm grounds, or even borings in hard grounds. Many organisms were boring within shells and left their mines. Like body fossils, trace fossils are classified and specified by a binominal scientific genus and species name.