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A less severe cold period or ice age is shown during the Jurassic-Cretaceous (150 Ma). There have been five or six major ice ages in the history of Earth over the past 3 billion years. The Late Cenozoic Ice Age began 34 million years ago, its latest phase being the Quaternary glaciation, in progress since 2.58 million years ago.
500 million years of climate change Ice core data for the past 400,000 years, with the present at right. Note length of glacial cycles averages ~100,000 years. Blue curve is temperature, green curve is CO 2, and red curve is windblown glacial dust (loess). Scale: Millions of years before present, earlier dates approximate.
[11] [12] In 1926, a Berlin astronomer was predicting global cooling but that it was "ages away". [13] Concerns that a new ice age was approaching was revived in the 1950s. [14] During the Cold War, there were concerns by Harry Wexler that setting off atom bombs could be hastening a new ice age from a nuclear winter scenario. [15]
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate between glacial periods. The Last Glacial Period ended about 15,000 years ago. [1]
Over time, this developed into the concept that they were all part of a much longer ice age. [citation needed] The concept that the Earth is currently in an ice age that began around 30 million years ago can be dated back to at least 1966. [12] As a geologic time period, the Late Cenozoic Ice Age was used at least as early as 1973. [13]
The Sturtian glaciation persisted from 720 to 660 million years ago, and the Marinoan glaciation which ended approximately 635 Ma, at the end of the Cryogenian. [12] The deposits of glacial tillite also occur in places that were at low latitudes during the Cryogenian, a phenomenon which led to the hypothesis of deeply frozen planetary oceans ...
The Sturtian glaciation was a worldwide glaciation during the Cryogenian Period when the Earth experienced repeated large-scale glaciations. [ 3 ] [ 4 ] As of January 2023 [update] , the Sturtian glaciation is thought to have lasted from c. 717 Ma to c. 660 Ma, a time span of approximately 57 million years. [ 3 ]
The Pleistocene glaciation is a link to and treated in great detail in Quaternary glaciation, and some of the information here in Timeline of glaciation seems to be missing there. I propose to move the in-detail stuff to Quaternary glaciation, and give a short outline of all four major glaciation episodes here.--