Natural heritage

The Tweed's geological history extends over 360 million years, with two distinctive volcanic periods occurring some 200 million years apart. These, and the forces of erosion over the past 20 million years, combined to create one of the largest erosion calderas, or cauldron-like landscape hollows, in the world.

Explore the area's geological history and the Museum's permanent collection of thunder eggs, along with the Adrian Smith Mineral Collection.