Figure 3. Schematic lithologic and paleogeographic map of the
Middle Russian paleorifts for the end of the Late Riphean and
Early Vendian.
(1-4) facies: (1) fluvial deposits with glacial materials,
(2) alluvial-proluvial red beds, (3) variegated sands and clays
of shallow-sea and lake origin, (4) variegated sandy and clayey
deposits of shallow-sea origin, (5) crystal-clastic tuff and
occasional acid lava, (6) tuffite and pyroclastic sedimentary
rocks, (7) undifferentiated deposits mapped from seismic
profiling data, (8) areas of eroded or missing deposits of the
Late Riphean and Lower Vendian top, (9) inferred volcanic
centers, (10) inferred volcanic centers eroded in Late Vendian
time, (11) direction of the removal of glacial clastic material,
(12) direction of the removal of mature clastic deposits, such
as the products of the erosion of the Riphean platform
sediments, (13) active faults, (14) facies boundaries,
(15) sites of drill holes and rock thickness in meters.