The Prehistoric Periods is the first volume in a series of publications where the results of the Danish/ Greek excavations 1995 to 2001 in Ancient Chalkis in Aetolia, are published. For the first time ever, stratigraphically excavated deposits from the Final Neolithic, the Early Helladic, Middle Helladic and the Late Helladic periods in Northwestern Greece are published and presented in their proper scientific contexts. In addition to the archaeological contexts geological surveys in the area and studies in the fauna of marine shells and animal bones from the prehistoric layers are submitted. The results are supported by a series of C14 dates.