This fossil specimens exhibits two trilobite specimens on a limestone matrix which measures 9 x 6 cm. The two species depicted are elrathia longiceps and chancia idahoensis, which were fauna which lived during the middle of the Cambrian period, 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, measuring only up to 1 cm in size. One side of the matrix has been cut, likely to avoid damaging the fossil while removing excess rock. However, this also acts as a flat surface which, if you wish, you can stand the specimen up on. It will come supplied in a card tray with an information label.