I looks like the tip of a well made, thin point made of good quality quartz. Painting with a very broad brush: The thinner, better made quartz stuff in that area tends to be paleo or early archaic. During those time the people were still moving around a lot and could travel to the better stone sources, so their sites tend to show use of quartz and quartzite as secondary materials. If there is a paleo or early archaic component to the site, you should find chert/jasper from Cattail Creek (Williamson Site in Dinwiddie) and/or some of the better North Carolina materials like rhyolite and silicified slate. If it's almost entirely quartz and quartzite flakes, points, etc., probably mid-archaic or later.