Mars has Been Through Many Ice Ages in the Last Billion Years

[Fraser]

Like Earth, Mars has experienced periods of extreme glaciation or ice sheet coverage, which are known as ice ages. As these ice ages come and go, glaciers expand and contract along the planet’s surface, grinding huge boulders down to smaller rocks. By examining the size of boulders and rocks at specific locations on Mars, we …
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[cannongray]

It is believed that Martian glaciers formed as a result of fluctuations in the inclination of the planet's rotation. And if there have been several glaciations over the past 10-100 million years, as Levy estimates, then Mars in the recent past was extremely unstable.