Systematic archaeological excavations at the site Gropi-Stari Guran, located west of Vodnjan, Croatia, were carried out in the period 2002-2008. Documented was a thin cultural layer that followed the shape of bedrock, containing prehistoric pottery. Among recovered ceramic fragments, those that are most probably parts of the same vessel decorated with applied sharp cone-shaped bossets, are distinguished. Termoluminiscence technique for dating the ceramic fragments found in US 33 (in the area of the basilica) was used and gave the age of 2800 BC (+ 380) (ft. 29), while typological analysis gave the datation to the Early Bronze Age, around 1800 BC. Even if we take into consideration the earlier dating (proposed by Batovic) of the vessels decorated with applied bossets, we still do not manage to relate the data obtained. With several newly discovered sites, Gropi-Stari Guran corroborates the statement of the existence of open-air settlements in the Istrian region during the Bronze Age Abridged Publication Abstract