'Golden spike' showing the moment Earth turned into a giant snowball discovered in ancient Scottish rocks - Livescience.com

* 'Golden spike' showing the moment Earth turned into a giant snowball discovered in ancient Scottish rocks  Livescience.com
* Remote Scottish isles may solve ice age puzzle  BBC.com
* Irish-Scottish rock formation may be rare record of ‘snowball Earth’ period  The Guardian
* Geologists find solid evidence of ancient ‘snowball Earth’  Popular Science
* Scotland and Ireland rock formation dating back 'hundreds of millions of years' shows historic global freeze, study says  Sky News


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