The Shale Sandstone Transition Forest, also known as Cumberland Shale-Sandstone Ironbark Forest, is a transitory ecotone between the grassy woodlands of the Cumberland Plain Woodlands and the dry sclerophyll forests of the sandstone plateaus on the edges of the Cumberland Plain in Sydney, Australia. Listed in 2001 under the Environment Protection and Biodiversity Conservation Act 1999, the forest lies between other ecological communities found on shale or sandstone substrates.