This Isabelinia glabrata is found in a concretion in the shale so that it is very inflated preserved. The occurrence Trilobite concretions is quite uncommon for Valongo. | |||
Location: | Valongo - Portugal | ||
Size trilobite: | about 72 mm long, | ||
Age: | Middle Ordovician , Llandailo (about. 464. Ma) |