In the contact zone of Russian platform and Baltic shield (Arkhangelsk region) Lower Carboniferous sediments containing plant remains are found for the first time. The remains of fossil wood Palaeoxylon bourbachensis Coulon et Lemoigne know earlier only from the Upper Visean of Vosges (France) evidence the age of host strata as the Late Visean. The development of land vegetation in these region during the Late Devonian - Early Carboniferous time is discussed.