This will be fun to read the comments.Utah is full of those who
still think the earth is only 6,000 years old....
Interesting, but there is more evidence to the snowball Earth than the microbial
extinction event. Changing the timing of the microbial extinction doesn't mean
abandoning the theory, but rather that the story of the extinction event is more
complex than previously understood.
The headline may be a little misleading: just through reading the story, it
seems the theory that there was a Snowball Earth is not being challenged; what
is challenged is the idea that Snowball Earth is what killed off a great many
species. The story seems to be saying the bacteria killed other forms of life
and later Snowball Earth occurred. -- Thanks, Joe