Example of contents in a geological box which is held in Anglesey's Centre for Art and History.

Item 1 (OYM8)
Type: Pyrite and Quartz - concretion mudstone
Geological Age: Carboniferous
Location: Durham
Historic Info: These are often known as beetle stones. They are nodules of rock into which fluids have been forced and hardened and then mineralised. The pattern can resemble a beetle's legs.