"One of the most puzzling aspects of the Sturtian glaciation is its astonishing length. While most ice ages last just a few million years, this one lasted a remarkable 57 million years, from 717 to 660 million years ago.
Researchers suggest that the combination of reduced volcanic CO2 emissions and extensive silicate weathering created a feedback loop that kept Earth trapped in a frozen state."
https://www.techbusinessnews.com.au/news/scientists-uncover-the-cause-of-earths-longest-ice-age-700-million-years-ago/
