English: Two cross section graphics Wolfegg – Rot a.d. Rot of some Glacial series in the Alpine Foreland, showing the movements of glaciers during the Riß glaciation and theWürm glaciation. The upper graphic shows that melting water in front of the advancing or receding glacier terminus was impounded by northern terminal moraines of two ice ages. The rocky floor of the lake was drastically deepened by the second thrust of the Riss glaciation.
The lower graphic shows that two thrusts of the Würm glacier piled up masses of debris as terminal moraines. Enormous amounts of sand and gravel lifted the ground level drastically. From now on the Zungenbecken was barred by southern and northern terminal moraines. With the postglacial temperature rise the flat lake area slowly silted up, as water plants invaded the lake.