In the geological history of billions of years, there have been at least three major ice ages in the world, including the late Precambrian ice age, the Carboniferous-Permian ice age (late Paleozoic ice age) and the Quaternary ice age.
The Precambrian Great Ice Age was an influential Great Ice Age about 9.5 ~ 6/kloc-0.50 billion years ago. Its remains have been preserved in many parts of the world except the Antarctic continent, and most of them are separated by non-glacial sedimentary rocks, indicating that the ice age was multi-stage. It was first discovered in Scotland and Norway, and then in China, Australia, Africa, Greenland and North America. It is represented by moraine in Finnmark, northern Norway. Nantuo moraine with scratches at the bottom of Sinian system in China is mainly distributed in the middle and lower reaches of the Yangtze River.
The Great Ice Age of the Late Paleozoic occurred from the Middle Carboniferous to the Early Permian. At that time, the global temperature generally dropped, forming a large area of ice sheets and glaciers, which lasted for 80 million years and was the most far-reaching major ice age in the history of the earth. Found in India, Australia, South America, Africa and the edge of Antarctic continent. Southeast Australia and Tasmania were the areas with the strongest glaciation during the Great Ice Age.
The Quaternary Great Ice Age began about 2-3 million years ago and ended 654.38+0-20,000 years ago. On a large scale. On the southern edge of the European ice sheet, it can reach 50 north latitude; The front of the North American ice sheet extends to the south of 40 north latitude; The Antarctic ice sheet is also much bigger than it is now. Including alpine glaciers and foothills glaciers near the equator, all extend downward to a lower position.