Sites 3 and 4 at Brześć Kujawski are multiperiod settlements, including two major periods of Neolithic occupation.   The first, by the Linear Pottery culture, took place during the last centuries of the sixth millennium B.C., while the second, by the Brześć Kujawski Group of the Lengyel culture, occurred in the second half of the fifth millennium B.C.    First excavated by Konrad Jażdżewski in the 1930s,  Ryszard Grygiel of the Museum of Archaeology and Ethnography in Łódź and Peter Bogucki, then a graduate student at Harvard University, resumed work at Brześć Kujawski in 1976 and continued through the early 1980s.   A good overview of our work can be found in our 1983 article in Scientific American linked in the Selected Publications section of this website.