 At that time the area, which included most of what is now Neutral Bay and Kurraba Point, was called "Alfred Thrupp’s Farm" or "Thrupp's Acres".Sandstone was quarried from what is now Kurraba Point Reserve from around 1850 to supply stone for the construction of Fort Denison as well as ballast for ships returning to England and for local building.Through these times, the point was known as "Thrupps Point" and "Ballast Point".