 Complete the following phrase:  According to an unambiguous stratigraphic record the formation process extended over three glacial periods. The massive Central Alpine pleistocene glaciers, that almost reached to the area of modern Munich, discharged not only water but also large amounts of soil and rock into the Alpine Foreland. When the glaciers melted during interglacial warm periods, huge quantities of gravel, debris and water were released and flushed to the north, where they were mainly deposited on the Munich gravel plain. The lowest strata contains solidified deposits from the Mindel glaciation, above it lies gravel from the 