Humans have lived in what is now Pennsylvania since at least 10,000 BC. The first settlers were Paleo-Indian nomadic hunters known from their stone tools."Note": For a general overview of Native American History in the West Branch Susquehanna watershed, see "Note:" ISBN refers to the Heritage Books July 1996 reprint. URL is to a scan of the 1892 version with some OCR typos.</ref> The hunter-gatherers of the Archaic period, which lasted locally from 7000 to 1000BC, used a greater variety of more sophisticated stone artefacts. The Woodland period marked the gradual transition to semi-permanent villages and horticulture, between 1000 BC and 1500 AD. Archeological evidence found in the state from this time includes a range of pottery types and styles, burial mounds, pipes, bows and arrow, and ornaments.