Here is a detailed trilobite of the species Gravicalymene arcuata from the upper Ordovician of Wales. The fossil is nicely centred on the matrix. | |||
Location: | Cynwyd / Corwen , N. Wales | ||
| Size trilobite: | about 10 mm long | ||
| Age: | Ordovician, LAshgill, Dolhir Beds (about. 449 Mill. Years) | ||