http://lmgtfy.com/?q=25+million+year+old+sheets+of+ice+at+the+poles
No offense, I'm just failing to find any pertinent information. Well, 2 quite flamey sites.
Adding the words flood, moses, and bible do not help much . . .
First one Lake Vostok....
The lake was drilled into by Russian scientists in 2012. The overlying ice provides a continuous paleoclimatic record of 400,000 years, although the
lake water itself may have been isolated for 15 [7][8] to 25 million years.[9] On 5 February 2012, a team of Russian scientists claimed to have completed the longest ever ice core of 3,768 m (12,400 ft) and pierced the ice shield to the surface of the lake.[10] As soon as the ice was pierced, water from the underlying lake gushed up the borehole.[11]
The first core of freshly frozen lake ice was obtained on 10 January 2013 at a depth of 3,406 m (11,175 ft),[12] and it is yet to be analyzed.[13] The Russian team plans to lower a probe into the lake to collect water samples and sediments from the bottom. It is hypothesized that unusual forms of life could be found in the lake's liquid layer, a fossil water reserve. Lake Vostok contains an environment sealed off below the ice for millions of years, in conditions which could resemble those of the hypothesized ice-covered ocean of Jupiter's moon Europa.[14][15]
http://www.windows2universe.org/earth/climate/CDcourses_investigate_climate.html
This ice layer can become quite deep over time; the 25 million year old East Antarctic Ice Sheet is more than 4.5 kilometers thick in places.
http://en.wikipedia.org/wiki/Miocene
There is evidence from oxygen isotopes at Deep Sea Drilling Program sites that ice began to build up in Antarctica about 36 Ma during the Eocene. Further marked decreases in temperature during the Middle Miocene at 15 Ma probably reflect increased ice growth in Antarctica. It can therefore be assumed that East Antarctica had some glaciers during the early to mid Miocene (23–15 Ma). Oceans cooled partly due to the formation of the Antarctic Circumpolar Current, and about 15 million years ago the ice cap in the southern hemisphere started to grow to its present form. The Greenland ice cap developed later, in the Middle Pliocene time, about 3 million years ago.
http://planetearth.nerc.ac.uk/news/story.aspx?id=192&cookieConsent=A
Arctic ice may have formed 20 million years earlier than previously thought
5 October 2008
Geologists have long debated when the poles first started icing over. Most think that Antarctica saw ice vastly earlier than the Arctic.
But, research reported in Nature suggests that previous estimates for exactly when the northern hemisphere first glimpsed ice could be out by around 20 million years.
Scientists usually compare the ratio of the two main oxygen isotopes - heavy oxygen and ordinary oxygen - in the remains of single-celled marine organisms in ocean sediments to find out when ice sheets formed. Geologists think two things determine this ratio: the amount of ice at the poles and temperature. Using this approach to look at the ratio of oxygen isotopes in the shells of marine organisms, scientists can figure out when ice sheets started emerging.
North south divide
Researchers discovered long ago that Antarctica started freezing over around 34 million years ago. And until now most scientists thought that the northern hemisphere started freezing around 31 million years later - just three million years ago.
Recently scientists have questioned this view, because other evidence points to the northern hemisphere icing over much earlier. Some scientists think that the amount of carbon dioxide in the atmosphere holds the key to controlling the timing of ice sheet formation.
http://www.windows2universe.org/earth/climate/CDcourses_investigate_climate.html