Ichnology studies the traces of activities left by modern and ancient animals. The advantage of trace fossils of biological activity and solid fossils is that the trace fossils are not modified by late diagenesis. They are the original deposits of organisms on the sedimentary environment and can directly reflect the living habits of animals and their living environment. According to the sedimentary substrate in which animals live, trace fossils can be divided into tracks, traceways, trails, crawling traces, resting traces, burrows on the soft ground, and erosion traces made by animals on the hard ground.
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Jian Fu (2024) studied this question.
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