Where to pick up swallow stone fossils in Qingzhou

Shandong Province along the coast. Swallow stone is a kind of marine organism, whose scientific name is trilobite fossil. It is mainly produced in Shandong Province and can be found along the coast of Shandong Province. Swallow stone, called swallow stone because its fossil insect body is shaped like a flying swallow, appeared in the Cambrian period of the Paleozoic era, reached its peak in the Silurian period, and became the king of the sea.