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Terrestrial Origins and Evolution
A stromatolite on a large basalt clast from the Copper Harbor Formation on the Keweenaw Peninsula in Michigan
06/26/13

 

A stromatolite on a large basalt clast from the Copper Harbor Formation on the Keweenaw Peninsula in Michigan. Gallagher says this formation is thought to have originated from river deposits. If so, a stromatolite here would be suggestive of life in a terrestrial setting. Credit: Timothy Gallagher



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