Ciliscutellum ciliensis Trilobite in Natural Nodule from Silurian, China (1.33")Species: Ciliscutellum ciliensis Size Trilobite: 1. 33" = 3,38 cm Age: Silurian (~430 million years ago) Location: Cili County, Hunan, China Condition: No restoration One of the most aesthetically unique trilobites of the Silurian period: the Ciliscutellum ciliensis. This specimen is preserved within a natural limestone nodule, a rare form of fossilization that protects the creatures delicate features from the pressure of millions of years of rock