 The park consists of 2,679 hectares of woodland, predominantly dry schlerophyll forest on the ridges and low heath in the wetter areas.The Hawkesbury sandstone has been carved up by various watercourses like Heathcote Creek, Kingfisher Creek and Myuna Creek, creating deep valleys.The Hawkesbury sandstone has created a sandy, infertile soil that is typical of the Sydney region.