Conversation

"The Garvellach islands off the west coast of Scotland are the best record of Earth entering its biggest ever ice age around 720 million years ago, researchers have discovered.
The big freeze, which covered nearly all the globe in two phases for 80 million years, is known as "Snowball Earth", after which the first animal life emerged." #geology

https://www.bbc.com/news/articles/cj9l2mrn43jo