Pitted Ware Culture

I see a lot of referances to the "Pitted Ware" Culture when researching U4.
Who were these people with a high number of U4's?


"The Pitted Ware culture (ca 3200 BC– ca 2300 BC) was a neolithic Hunter-gatherer culture in southern Scandinavia, mainly along the coasts of Svealand, Götaland, Åland, north-eastern Denmark and southern Norway. It was first contemporary and overlapping with the agricultural Funnelbeaker culture, and later with the agricultural Corded Ware culture."



More after the link:

http://en.wikipedia.org/wiki/Pitted_Ware_culture