This fossil specimens exhibits two trilobite specimens on a limestone matrix which measures 7 x 7 cm. The two species depicted are elrathia longiceps and the tail segment of an olenoides nevadensis, which were fauna which lived during the middle of the Cambrian period, as trilobites were the main fauna in the ecosystem, making them between 509 to 497 million years old. They were found in the Metaline formation which is limestone, located in Metaline Falls, Pende Oreille in Washington, USA. The specimens are quite small, the elrathia longiceps measures 1.5 cm in length while the olenoides nevadensis tail is 2 cm wide . All sides of the matrix have been cut, likely to avoid damaging the fossil while removing excess rock. It will come supplied in a card tray with an information label, ideal for those keen on collecting fossils from the USA.