Hornsby Plateau

The Hornsby Plateau is a sandstone plateau lying to the north of Sydney Harbour, which is cut by steep valleys. The North Shore and the Berowra Valley National Park[1] are located on the Hornsby Plateau. Due to its hilly topography, it was slow to develop.[2] It has two main sedimentary rock layers: Hawkesbury sandstone, consisting mostly of sandstone, but with some shale, and the overlying Ashfield shale.

References
  1. http://friendsberowravalleynationalpark.com/html/landscape_-_geology.html
  2. http://www.eosnap.com/tag/hornsby-plateau/

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