| Rare mass mortality plate of the rare trilobite from north Wales. P. spinulosa is the type species of the genus Parabolina. | |||
Location: | Dolgella, north Wales | ||
| Size stone : | about 80 x 80 mm | ||
| Age: | Upper Cambrian, Dolgella series, , P. spinulosa Zone (about 400 mill. y.o.) | ||