During the last glacial period of the Würm glaciation, the Black Forest was covered by glaciers ; several tarns ( or lakes ) such as the Mummelsee are remains of this period.

During the most recent, so-called Würm glaciation, 10-12, 000 years ago the permanent snow line was at 2, 100 m above sea level.

During all the known alpine glaciations ( Günz glaciation, Mindel glaciation, Riss glaciation and Würm glaciation ), huge glaciers penetrated the Swiss Plateau.

During the Wisconsin glaciation, 50, 00017, 000 years ago, falling sea levels allowed people to move across the Bering land bridge ( Beringia ) that joined Siberia to north west North America ( Alaska ).

During periods of reduced regional glaciation that corresponded to global interglacial periods, Lake Titicaca had typically low lake levels.

During the final part of the last Weichsel glaciation, deglaciation in the central parts of the Isthmus started as early as 14000 BP, when it formed the bottom of a large lake dammed by the surrounding ice sheet.

During the Pleistocene ( c. 1. 8 to 0. 01 mya ), the watershed was extensively modified by continental glaciation.

During the Last Ice Age a c. 2. 4 million km² ice sheet covered the plateau. This glaciation took place in correspondence to a lowering of the snowline by 1200 m. For the Last Glacial Maximum this means a depression of the average annual temperature by 7 to 8 ° C at a minor precipitation compared with that one of today.

During that glaciation which lasted for 35, 000 years, all of Ontario was covered in ice.

During periods of glaciation and resulting low sea levels, Cape York Peninsula provided a low-lying land link.

During the most recent Devensian glaciation, which is thought to have started around 115, 000 years ago, peaked around 20, 000 years ago and ended a mere 10, 000 years ago, the Usk valley and Wye valley were eroded by glaciers, with the icesheet itself reaching south to Wolverhampton and Cardiff.

During continental glaciation, the tremendous weight of the glacier depressed the area of the St. Lawrence so much that a lower point of drainage was established eastward through the present river system.

During the last glaciation period the whole gulf was dry land, with the sea level being around 100 – 110 m ( 300 ft ) lower than at present.

During periods of glaciation and resulting low sea levels, Cape York Peninsula provided a low-lying land link.

During the end of the last glaciation, Cape Cod Bay was probably a large freshwater lake with drainages across Cape Cod in places like Bass River and Orleans Harbor.

During the Riss glaciation, the source of the Durance was at Sisteron, where the icecap finished.

During this glaciation event, the world's sea level was about 320 feet ( 98 meters ) lower than today, due to the large amount of sea water that had evaporated and been deposited as snow and ice in Northern Hemisphere glaciers.

During the Mesozoic the paleopedological record tends to be poor, probably because the absence of mountain-building and glaciation meant that most surface soils were very old and were constantly being weathered of what weatherable materials remained.

During this ice-house period ( as scientists sometimes call periods of global cold weather and glaciation ), surviving species began to adapt.

During the latter part of the Hirnantian, temperatures rose, the glaciers melted, and sea level rose to the same or perhaps an even higher level than before the glaciation.

During the last phase of the Wisconsinan glaciation, the deteriorating continental glacier left behind connected lakes, known as Glacial Lakes Aitkin and Upham.

During World War II, Bonn acquired military significance because of its strategic location on the Rhine River, which formed a natural barrier to easy penetration into the German heartland from the west.

During the 1st millennium BC, they were spoken across Europe, in the Iberian Peninsula, from the Atlantic and North Sea coastlines, up the Rhine valley and down the Danube valley to the Black Sea, the Upper Balkan Peninsula, and in Galatia in Asia Minor.

During his Danube sojourn ( Drinkwater suggests in 255 or 256 ) he proclaimed his elder son Valerian II Caesar and thus official heir to himself and Valerian I ; the boy probably now joined Gallienus on campaign and when Gallienus moved west to the Rhine provinces in 257 remained behind on the Danube as the personification of Imperial authority.

During their brief diversion from the Eastern Roman Empire, the Huns appear to have threatened tribes further west, as evidenced by Radagaisus ' entering Italy at the end of 405 and the crossing of the Rhine into Gaul by Vandals, Sueves, and Alans in 406.

During the Reformation the Catholic Church was persecuted and the Dutch dioceses north of the Rhine and Waal were suspended by the Holy See.

During Charlemagne's campaign in Hispania ( 778 ), the Saxons advanced to Deutz on the Rhine and plundered along the river.

During the Napoleonic Wars, Breslau was occupied by an army of the Confederation of the Rhine.

During the 11th century, the Palatinate was dominated by the Ezzonian dynasty, who governed several counties on both banks of the Rhine.

During the early 1940s, several of Davis's film choices were influenced by the war, such as Watch on the Rhine ( 1943 ), by Lillian Hellman, and Thank Your Lucky Stars ( 1943 ), a lighthearted all-star musical cavalcade, with each of the featured stars donating their fee to the Hollywood Canteen.

During his reign, the Rhine and Danube frontier was strengthened after successful wars against several Germanic tribes such as the Goths, Alamanni, Longiones, Franks, Burgundians, and Vandals.

During 369, Valentinian ordered new defensive works to be constructed and old structures refurbished along the length of the Rhine ’ s west bank.

During that century, it was the " chief city " of the Rhine, Westphalia, the Netherlands Circle of the Hanseatic League.

During this time he also involved himself in polemics during the Rhine crisis of 1840, caused by the French prime minister Adolphe Thiers, who as Minister of the Interior had been Musset's superior.

During the tertiary, the High Rhine continued West from Basel and flowed via the Doubs and the Saône, into the Rhône.

During the 15th century, a war with the count palatine of the Rhine deprived the Margrave Charles I ( died 1475 ) of a part of his territories, but these losses were more than repaired by his son and successor, Christophe I of Baden ( illustration, right ).

During his tenure in the Council of States, he was given the mandate to negotiate an agreement with the Grand Duchy of Baden regarding the usage of the Rhine for ship transport and hydropower.

During the Seven Years ' War, he was promoted to lieutenant colonel and made assistant quartermaster general in the Army of the Upper Rhine, a division created by the disbanding of the Loewendal Regiment.

During the period of the Roman empire, more tribes were settled in areas of the empire near the Rhine, in territories controlled by the Roman Empire.

During the Napoleonic Era, as noted above, the Rhineland west of the Rhine River was incorporated into France and feudal structures were crushed.

During the War of the Polish Succession he took part in the 1734 Siege of Danzig led by Field Marshal Burkhard Christoph von Münnich, he marched against French troops up to the Rhine in 1735 and back to the Dnieper River into the Turkish campaign.

During the winter a Prussian army forced him to evacuate Frankfurt, re-cross the Rhine and fall back upon Landau.

During the English Civil War the town was a Parliamentarian outpost in a staunchly Royalist region, and as a result Bolton was stormed by 3, 000 Royalist troops led by Prince Rupert of the Rhine in 1644.

During his stay in Germania, the general ordered the construction of a canal between the rivers Rhine and Meuse.

During the Operation American, British, and Polish parachute troops, outside the control of Second Army, were landed to capture vital bridges over several rivers, in The Netherlands, in order to allow Second Army's XXX Corps to cross the Rhine and advance into Germany, relieving the parachute troops en route.