Based on lithogeochemical data for fine-grained clastic rocks of the Volyn, Valdai and Baltic series of the west of the East European Platform (Belarus and Volyn, partly Lithuania), categories of rivers that transported fine-grained aluminosiliciclastics to the sinks were reconstructed. It is concluded that the formation of Vendian and Lower Cambrian sedimentary sequences developed in this area was controlled mainly by river systems similar to modern large rivers (rivers with a catchment area 100000 km2) and rivers draining sedimentary formations (rivers with a catchment area 100000 km2). The fine-grained aluminosiliciclastics transported by them came mainly from areas composed of rocks of the crystalline basement of the platform and, in part, sedimentary formations. The distribution of data points of Vendian and Lower Cambrian clay rocks on the diagrams (La/Yb)N–Eu/Eu* and (La/Yb)N–Th with fields of composition of pelitic and silty-pelitic sediments in the estuarine parts of modern rivers of different categories shows that mafic rocks of the Volyn-Brest large igneous province, apparently, were not suppliers of fine-grained aluminosiliciclastics in the indicated time intervals.