land. Cooks River/Castlereagh Ironbark ecological community is a area of dry sclerophyll open-forest to low woodland/scrubland which occurs between and , as well as around the headwaters of the Cooks River. The woodland is dominated by broad-leaved Ironbark (Eucalyptus fibrosa) and Paperbark (Melaleuca decora). The Western Sydney Dry Rainforest is oftentimes found in sheltered gullies within the Cumberland Plain woodland, where it was originally 1,282 ha in size, but now only 338 ha remains. On the eastern peripheries of the plain, Shale Plains Woodland morphs into Turpentine-Ironbark Forest where the annual rainfall surpasses 950 mm. Rising to the Hornsby Plateau, the Turpentine-Ironbark Forest transitions into Blue Gum High Forest where the precipitation is above 1050 mm. Three discrete communities are acknowledged on margins of the plain, which are Shale Sandstone Transition Forest, High Sandstone Influence sub-communities and the Turpentine-Ironbark Margin Forest, which is present on the bounds of the Hornsby and Woronora Plateaus. Four communities were found on two isolated alluvial deposits in the northwest (Castlereagh) and southeast (Holsworthy) corners of the plain. These were, Cooks River/Castlereagh Ironbark Forest at 1,012 ha, which occur on soils with a high clay content, and Castlereagh Scribbly Gum Woodland being more common on sandy loam soils. Castlereagh Swamp Woodland is found in poorly drained slumps in the Holsworthy and Castlereagh areas. Wind-blown deposits in the section of Agnes Banks support a defined assemblage of hard-leaved species known as Agnes Banks Woodland, at 615 ha. On the margins of the alluvial sedimentation, Castlereagh Ironbark Forest transitions into Shale Gravel Transition Forest on separated alluvium superimposed on Wianamatta Shale, which is currently at 1,721 ha. The scarcest community on the Cumberland Plain is Elderslie Banksia Scrub Forest, at 13.4 ha, which is present on the deep sand deposition of the old alluvial rows of the Nepean River near Camden, where it morphs with Cumberland Plain Woodland and Sydney Coastal Riverflat Forest. The Riparian Forest, such as Coastal Swamp Oak Forest, is restricted to streams and adjoining swampy areas, and is closely related to Castlereagh Swamp Woodland when it comes to the floral species. Furthermore, Alluvial Woodland occurs on large floodplains more than 100 metres away from a river, where they transition into Shale Plains Woodland. Apart from these aforementioned woodland communities, another 11 vegetation communities are found scattered on the Cumberland Plain: Castlereagh Scribbly Gum Woodland Sandstone Ridgetop Woodland Upper Georges River Sandstone Woodland Western