Geologists have long struggled to understand massive time gaps in Earth’s rock record, where millions—sometimes billions—of ...

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 ...

Thirty years later, groups are no closer to increasing protections for the area made up of Frenchman Mountain, Rainbow Gardens and the Great Unconformity — a slab of exposed rock that reveals a ...

The Great Unconformity represents a gap in time in the Grand Canyon and other parts of the world. It is a geological feature ...

Taking second place on the list is the Grand Canyon in the United States. Spanning 278 miles, this geological wonder is a prime example of the Great Unconformity, where 250-million-year-old rock ...

The proposed national monument also includes the “Great Unconformity,” a geological rarity that represents about 1.2 billion years of Earth’s missing history, within its boundaries.