 Later erosion and sedimentation had long-lasting effects on the landscape, and may have caused the Waikato River to shift from the Hauraki Plains to its current course through the Waikato to the Tasman Sea.Less than 22,500 years ago, Lake Taupo, having filled to about above its current level, cut through its Oruanui ignimbrite dam at a rate which left no terraces around the lake.About of water was released, leaving boulders of up to at least as far down the Waikato River as Mangakino.