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Southbound view of the M1 Pacific Motorway carved through sandstone at Berowra. Six kilometres of sandstone and shale lie under Sydney. In Sydney sandstone, the ripple marks from the ancient river that brought the grains of sand are distinctive and easily seen, telling geologists that the sand comes from rocks formed between 500 and 700 million years ago far to the south.
The sheltered forest on transitional sandstone soils is an open forest or woodland dominated by eucalyptus trees with disjointed subcanopy trees, various shrub layer and a groundcover of ferns, forbs, grasses and graminoids, primarily on soft terrain, with slopes rarely surpassing 10°, and sandstone outcrops occur at parts, compared to areas within well-developed, precipitous gullies.
The Sydney Sandstone Ridgetop Woodland, also known as Coastal Sandstone Ridgetop Woodland and Hornsby Enriched Sandstone Exposed Woodland, is a shrubby woodland and mallee community situated in northern parts of Sydney, Australia, where it is found predominantly on ridgetops and slopes of the Hornsby Plateau, Woronora Plateau and the lower Blue Mountains area.
Sydney Sandstone Ridgetop Woodland – A shrubby woodland and mallee community situated in northern parts of Sydney on ridgetops and slopes of the Hornsby Plateau, Woronora Plateau and the lower Blue Mountains area. It is an area of high biodiversity, existing on poor sandstone soils, with regular wildfires, and moderate rainfall. [45] [46]
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.
Being very porous, the Sydney sandstone has shale lenses and fossil riverbeds dotted throughout and it is some 200 metres (656 feet) thick. The sandstone was probably deposited in a freshwater delta and is the caprock which controls the erosion and scarp retreat of the Illawarra escarpment. [23] Six kilometres of sandstone and shale lie under ...
It occurs around the Sydney Basin often in high rainfall areas on shallow sandstone soils on plateaux or escarpments, in fire prone areas. Growing as a gnarled tree to 20 m (66 ft), it is recognisable by its distinctive yellow-brown tessellated bark. The greyish green leaves are thick and veiny, and lanceolate spear- or sickle-shaped.
It is found on sandstone- or shale-based soils in open woodland, or on more sandy soils behind sand dunes. The white flowers appear in summer and autumn. It reproduces by resprouting from its woody lignotuber or epicormic buds after bushfire. E. botryoides hybridises with the Sydney blue gum in the Sydney region. The hard, durable wood has been ...