 The park is in the New England granite belt, where about 220 million years ago an episode of granite magmatism resulted in the intrusion of the Stanthorpe Adamellite into the surrounding metamorphic and sedimentary rock.Subsequent uplift and erosion of the New England Fold Belt has seen the majority of the surrounding sediments and metamorphic rocks eroded away, with the Stanthorpe Adamellite remaining due to its resistance to weathering.This regolith has created a landscape with many exposed inselbergs of granite rocks, some balancing on top of each other, or forming natural arches.