The great glacier masses coming from the north carried with them many Scandinavian rocks, so-called erratic boulders (erratic), which after ice melting remained in place. Their significance, apart from the tourist and utilitarian values, also lies in the fact that they help determine the directions of ice-sheet movement. Research on their location has made it possible to establish that the subsequent ice-sheets were coming to the Polish lands from slightly different directions. In Trzebnica there are the remains of two glaciations. In the lower settlements there are mainly eratians from the eastern Baltic zone and they come from the San glaciation (Elster). In contrast, the upper layer of sediments in Trzebnica mainly contains erratic from central Sweden and was formed during the Odra glaciation (Drenthe).
The largest erratic boulder in Lower Silesia lies near Jodłowice, in the district of Wołów. The name of the Roemer Boulder was given to commemorate C. F. Roemer (18181891), meritorious professor and creator of geology at the University of Wroclaw, among other in the study of erratic boulders. This granite boulder measures 13.4 m in circumference and protrudes over 2 metres. In Poland, the largest erratic boulder (gneiss) is located in Tychów (Biłogard district). Its circumference is 50 metres.
G – ERRATIC BLOCK
The stone of Saint Jadwiga in Głuchów
Roemer's boulder
Trygław boulder in Tychów
