In the six hundredth year of Noah’s life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened. And the rain was upon the earth forty days and forty nights.( Genesis 7:11-12 ) KJV
The theory ice ages, of successive retreats and advances of glacial ice, is needed to account for how billions of tons of rocks and debris have been moved around. It is no longer necessary.