Fig. 9From: Glaciofluvial sequences recording the Birrfeld Glaciation (MIS 5d–2) in the Bern area, Swiss PlateauAi–Zi plot showing the median values of the flattening (Ai) and roundness indexes (Zi) of quartzite clasts collected at MÜN, FIH-S, and FIH-N. Low Zi values = angular pebbles, high Zi values = rounded pebbles, low Ai values = spheroidal pebbles, and high Ai values = elongated/ flat pebbles. After Schlüchter (1976)Back to article page