Jensen and Ault report their findings in the journal Geology. "Unconformities in the rock record are like missing chapters in ...

Rainbow Gardens and the Great Unconformity — a slab of exposed rock that reveals a geologic oddity: about 1.2 billion years of Earth’s missing history. By Frenchman Mountain, a layer of 550 ...

New data from Colorado show parts of the Great Unconformity may have formed 1.4 billion years ago—far earlier than theories tied to the Snowball Earth glaciation. Though martite looks like its ...