It is believed that Haplogroup G originated in the area of the Middle East during the late Paleolithic era, as many as 30,000 years ago. Then humans would have been exclusively hunter-gatherers, and almost invariably living in small nomadic or semi-nomadic tribal groups. We find that members of this haplogroup seemed to have been intimately linked to the early development of agriculture in the Levant part of the Fertile Crescent, beginning 11,500 ago. There has been ancient Y-DNA analysis from only four Neolithic cultures to date. They include: LBK in Germany, Remedello in Italy and Cardium Pottery in Southwest France and Spain. In all of these sites were found G2a individuals This is the strongest evidence yet that farming began with with and was spread by members of Haplogroup G.
Read the Wikipedia Article on Haplogroup G
Visit the website of The Haplogroup G Project
Visit the ISOGG page on Haplogroup G
Read the Eupedia Article on Haplogroup G