 However, Hokan speaking people may have inhabited the area even earlier, and archaeological evidence shows human settlement to have begun at least by 4000 BC.The Ohlone tribesmen subsisted from hunter-gatherering the bountiful amount of land and sea life of the area.Especially the great amounts of seafood made available along the coastline of Castro Cove and the surrounding marshlands and delta of Wildcat and San Pablo creeks.