The Szamotuly Graben covers the southernmost part of Permo-Mesozoic Poznan–Szamotuly Fault Zone. Along this regional discontinuity there are several salt structures, including diapir, over which an extensional graben formed in Paleogene and Neogene. is located north Poznan central-western Poland, NW–SE-trending, ~20 km long, 3–5.5 wide, up to 160 m deep. It filled with Lower Oligocene Neogene s...