From the accompanying plaque:
He atua mo te Wao-nui-a-Tāne
Tāne is god of the forest. He was responsible for the separation of his parents Ranginui (sky father) and Papatūānuku (mother earth). Tāne lay on his back between them and, using his legs, thrust his father upwards. This enabled Tāne and his siblings to escape into the world of light.