The Geology Collection consists of approximately 8000 rocks and minerals and 3000 fossils from all over the world.
It includes notable samples from north Wales, for example unique reference finds by Dr Edward Greenly who was the first geologist to describe and map the geology of Anglesey in the early 20th century.
The names used to describe the international geological timescale (for example, Cambrian, Silurian and Ordovician) were first used by geologists working in north Wales in the late 19th and early 20th century and the Geology Collection contains many samples extracted during this time.
A selection of the collection is displayed in the corridor of the Brambell Natural History Museum, Brambell Building. The fossil collection is also housed here. The remainder of the collection is housed in the Thoday Building at present.
The Brambell Natural History Museum is not open to members of the public on a regular basis, but occasional open days are organised to provide access.