Charles Darwin also wrote of people (Aborigines) at Emu Ford, commenting on their skill with spears, while Watkin Tench of the Royal Marines also noted their use of spears, lines and nets to capture fish.
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Near Penrith, since 1971 numerous Aboriginal stone tools were found in Cranebrook Terraces gravel sediments deposited by the Nepean River 40,000 to 50,000 years ago, according to repeated, revised and corroborated radiocarbon and thermoluminescence dating.
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The Cordeaux River rises on the western slopes of the Illawarra escarpment, below Mount Keira within the Wollongong local government area and flows generally north and northwest, joined by the Avon River, before reaching its confluence with the Nepean River, south of Wilton.
However, in the 1820s, under Governor Brisbane, Blaxland obtained good land in the Nepean (800 acres called "Grove Farm" where he had built a weir and brewery where barley and English soft wheat were grown at what became Wallacia) and Hunter Regions as a result of discovering a route to the area.
On 22 May, at the Ned Hanlan-Elias C. Laycock exhibition match on the Nepean river, he won the All-comers' Light Skiff with 25 lb, defeating four others.