The fossils at Shanwang come from the Shanwang Formation, a series of diatomite beds deposited during the early to middle Miocene epoch. Diatomite forms from the accumulated silica shells of diatoms, single-celled algae that lived in the ancient lakes of the region. Because the sediment is so fine-grained, it acts like a natural casting material, capturing details that coarser rock would obliterate. The result is a fossil record of extraordinary resolution. Insect specimens preserve clear, intact veins on their wings, and some have even retained traces of their original color. Vertebrate fossils show outlines of skin and hair, features rarely preserved elsewhere in the world. Over 600 species have been identified across a dozen categories, ranging from insects, fish, spiders, and amphibians to reptiles, birds, and mammals.

The diversity of fossils at Shanwang is as remarkable as their preservation. Among the insects alone, researchers have classified 11 orders, 46 families, 100 genera, and 182 species. The birds found here are the most abundant and best-preserved avian fossils yet discovered in China. Ancient deer and bear specimens rank among the finest from the Miocene period found anywhere on Earth. The plant record is equally rich: mosses, ferns, gymnosperms, and angiosperms are all represented, along with over 100 species of algae. In total, the plant fossils span 46 families, 98 genera, and 143 species. Together, these specimens reconstruct an entire ecosystem, from the algae in the water to the deer browsing at the forest edge.

Shanwang is not only a fossil site. The park covers approximately 13 square kilometers of terrain shaped by volcanic activity that predates and overlaps with the fossil-bearing lake deposits. This volcanic topography created the basins where diatom-rich lakes formed, providing the conditions necessary for the exceptional fossilization that occurred. The landscape today is one of gentle hills and eroded volcanic features, quite different from the flat agricultural plains that dominate much of Shandong. Located about 22 kilometers from Linqu County, the park has been designated a national geological park in recognition of both its paleontological and geological significance.

In paleontology, sites of exceptional fossil preservation are called Lagerstatten, a German term meaning "storage places." Shanwang qualifies as one of only a handful of such sites in China, and it stands alongside deposits like Germany's Messel Pit and Canada's Burgess Shale as a place where the fossil record achieves unusual completeness. What distinguishes Shanwang is the combination of exceptional preservation quality, remarkable species diversity, and the sheer number of specimens recovered. It is a place where seventeen million years of geological patience produced a record of ancient life so detailed that a single insect wing can be read like a page from a field guide written in stone.