Introduction to biomarked fossils: On rock walls or rock formations close to the sea, you can often see large, network-like tubular carvings. These patterns are the remains of ancient creatures. In addition, the traces or remains of movement, feeding, and crawling left by paleontological organisms on beaches and soft seabed sediments. After being buried and preserved, fossils with biological traces are formed, referred to as "biotrace fossils". The picture shows the trace fossils in Xitou Forest Park.