 At about the same time a series of parallel dunes formed behind Bate Beach and Towra Point as the Georges River estuary shifted and sand and mud was dropped to the north of the Kurnell isthmus.The mud and sand deposit breached sea level and a dune formed on the deposit.This dune was vegetated with Kurnell dune forest, treed wetland, littoral rainforest, mangroves, sheoaks and saltmarsh.