Traces of the older Günz and Mindel glaciation are only left in a few places, because most has been removed or transferred by the later glaciations. The greatest extension was reached by the glaciers of the Riss glaciation, when the entire Swiss Plateau was covered with ice except for the Napf and Töss regions. Most notable are the traces of the Würm glaciation about 15 000 years ago. The end moraines of different glacial retreats have been conserved.