[Geology2] Geology: North America's broken heart

Geology: North America's broken heart

A billion years ago, a huge rift nearly cleaved North America down the middle. And then it failed. Researchers may be getting close to finding out why.

• Jessica Marshall

04 December 2013

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Basalt cliffs along the St Croix River are remnants of rifting 1.1 billion years ago.

MARVIN DEMBINSKY PHOTO ASSOCIATES/ALAMY

http://www.nature.com/news/geology-north-america-s-broken-heart-1.14281

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